Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8754a548c02e1c3…

MALICIOUS

PDF

43.2 KB Created: 2020-10-28 22:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cacf0112cef50b4446c944afb723cf55 SHA-1: 006861747f6a5693726559af78a16e3d487f12fb SHA-256: d8754a548c02e1c3692918a42a2a0dd8952430f1edb283508aeaf8cf4fb6a9e9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to disposable domains and are identified as a link farm. One URL is specifically flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gettraff.ru/123?keyword=fallout+shelter+unlimited+lunch+boxes In PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/bopalufiledilurawefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f96a4283b409.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/zenawaw.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/tituj-geloka-lalij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5f98bf30600b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f914e2a822e5.pdfIn PDF document text
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/1486307.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/4540722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416321/normal_5f98ca3312615.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/2083024.pdfIn PDF document text
    • https://tojetipa.weebly.com/uploads/1/3/4/2/134234581/bufupaditumik.pdfIn PDF document text
    • https://sijerixo.weebly.com/uploads/1/3/4/0/134042725/1ec37f9d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_5f8dabd7ef4e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5f98b30a84bef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa87732-45de-4bdd-9e50-45f58bb9ac72/study_guide_13_accounting_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8697/7441/files/dslr_photography_tutorials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26017fcb-135f-46a3-b295-8b4b7df131c4/3175829021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/2478/7867/files/god_of_war_2_ppsspp_iso_apkandro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6038/8252/files/alpha_in_word_document.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000697b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x697B 5344 bytes
SHA-256: d6ee6d47df2c99d53087eb9ad46762b05fd5a5d9620bf1d672ef471052fa624b
font_01_sfnt_off00007b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7C 10668 bytes
SHA-256: bfc025b0267ba5ac83a6934abf9c2a547092a7523cc44ab057f3311977579651

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