Malicious PDF — malware analysis report

Static analysis result for SHA-256 5964fb51fa076ac2…

MALICIOUS

PDF

33.1 KB Created: 2020-10-30 09:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 173f8b31520cf762f0b28a3204c83e7c SHA-1: d8cb1ed3f28a74af901c4ea98ceed3d8305a79bd SHA-256: 5964fb51fa076ac2844804e2f2273d90f1f6e1abe3fd5fbb207d75c7e2abe445
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/aws?keyword=master+fard+muhammad+wife In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f8e08aba9cc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f87e1db78161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5f92750c4131d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_5f92a89a6cfee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5f9938b0e20c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f8c89935ae8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f86f60e5eb76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f886bb40a9f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_5f92e0fb06ef4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9035/3562/files/racing_rivals_hack_apk_free_download_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7622/6724/files/aventura_workbook_answers.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_off000042e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42E1 5212 bytes
SHA-256: f856f3064727fc9848a5442f721d4040e0585ef9bb388c0b560dc4d670df32ee
font_01_sfnt_off0000548c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x548C 10384 bytes
SHA-256: 381ca1bac7f5840477b4ac71b676fd9f691a491f91453ebc9154e36ab4cc5aa1

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