Malicious PDF — malware analysis report

Static analysis result for SHA-256 628e1a79c16f70ec…

MALICIOUS

PDF

45.8 KB Created: 2020-11-09 06:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9e9bfa2aac7ee79cda9df321b65dbe83 SHA-1: 76531695d7a43b95fdf20846a423c42d7ebc11d4 SHA-256: 628e1a79c16f70ec7c29b0cdb90920de206bbfe9758df1db9709fb634f1bb5ec
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many pointing to external PDF files hosted on disposable domains. One URL, https://cctraff.ru/123?keyword=non+promotion+counseling+e4, is identified as a malicious redirector. The document's structure and link farm suggest an attempt to manipulate search engine results or distribute further malicious content, likely via a spearphishing attachment delivery vector.

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://cctraff.ru/123?keyword=non+promotion+counseling+e4 In PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/pokobu-pidoror-pekirez.pdfIn PDF document text
    • https://kuvikupomudu.weebly.com/uploads/1/3/4/4/134457818/7926665.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/7622433.pdfIn PDF document text
    • https://jabezenenadako.weebly.com/uploads/1/3/4/2/134234778/1211535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407102/normal_5f99ec2b18a77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f8cc56f660f2.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/9845223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f8db09551e5a.pdfIn PDF document text
    • https://zubujaxu.weebly.com/uploads/1/3/4/5/134585886/48afd569a2adbf.pdfIn PDF document text
    • https://jijibaduwa.weebly.com/uploads/1/3/4/4/134495912/8151724.pdfIn PDF document text
    • https://zowutopukanujim.weebly.com/uploads/1/3/4/2/134235103/8464695.pdfIn PDF document text
    • https://dumejolizaxoko.weebly.com/uploads/1/3/0/8/130814858/gorosuxalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5f9c5b2b9fa99.pdfIn PDF document text
    • https://lajanasana.weebly.com/uploads/1/3/4/3/134368101/makimenadujikuzojej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/26641379995.pdfIn PDF document text
    • https://bafelego.files.wordpress.com/2020/11/acadia_national_park_hiking_map.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_off00007671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7671 5100 bytes
SHA-256: aeef7680370c4f4b7492bb861d93239f89947afb6efb4a6537327fa7589ad9b9
font_01_sfnt_off000087c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87C5 10052 bytes
SHA-256: 4d19b63c451a97b8099b6ce8d2b26b64842d7b7142dd1b63bc8440163233284e

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