Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da0f5df0b78add6…

MALICIOUS

PDF

50.2 KB Created: 2020-10-29 05:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 11c8e30f80fb2eb73559010ddc6d2f3e SHA-1: 8ff03e895091b5f1bec7a7a8719075237ac95cb3 SHA-256: 9da0f5df0b78add68d2014337dbe273bc44e558c61f9f5698e098e8e02763588
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many pointing to disposable hosting services, indicating a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/strik?keyword=lam+sau+wing+money+radio. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links suggests an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/strik?keyword=lam+sau+wing+money+radio In PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/nogesizufebaweg-japisidep-negaratopofazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5f8b23bd6e4f7.pdfIn PDF document text
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/56488bba.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/nokekul-feboji.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/bivok_bamikazatives_vanaditup_gevituji.pdfIn PDF document text
    • https://fukoxifixe.weebly.com/uploads/1/3/4/4/134460993/c32dcb9bf830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_5f95e055590be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f8ccc80d9e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f8ef3527dbf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5f945cf6946e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376852/normal_5f8a479f84b05.pdfIn PDF document text
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/bea96b28.pdfIn PDF document text
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/822cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f9a0bf88e057.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a3ae688f-41aa-40dc-8abe-4dc5586071f8/30727573379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/2417/7093/files/pokerstars_app_android_real_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba13a1c6-fe93-4023-a5ac-4e75ec0c2d33/gasoregeliv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bf12ca5-88c8-4884-8d11-a78d6fb3a7f4/75941677401.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9010/8833/files/fordham_university_gpa_acceptance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3210/5119/files/jopetuvamitazawasifuzuwox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4131/9831/files/52959382503.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50CA 4968 bytes
SHA-256: 6b2204499ebd777f71ce33ee4f30dd060d8c456d7cc860844c8148bec3440ec9
font_01_sfnt_off000061f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 5052 bytes
SHA-256: d9fe9c4ca0db013c4ec7ce5d442e8e338c59a82e12bc0f11bdd7a66b8edc50d7
font_02_sfnt_off00007308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7308 8696 bytes
SHA-256: d35c1ba54d5d955708096bf22deb7228c465ebaa5db58a9031477938e8ec3457
font_03_sfnt_off00008a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A46 10020 bytes
SHA-256: c41f52e6424b4feff1004eee49c914cec7c07bdb806dedfb815621e4a545ad9a
font_04_sfnt_off0000ac9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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