Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4eab774b957c5b…

MALICIOUS

PDF

43.3 KB Created: 2020-10-29 15:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e8d8e77d26c46d64eff476fe042b5df8 SHA-1: 158c7abc07e70d438a99f43a92808dcd1bf50c80 SHA-256: 5d4eab774b957c5bf03c147ec2f6c854128c384566c59bc7582fef9394b28f0b
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://ttraff.me/123?keyword=an+activity+series+lab+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5f96826d21f4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413458/normal_5f95399f864ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f8cf213dd5af.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/728af481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f8885ca4e709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_5f98d9f0d97ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/955936b5-bc8d-4187-a512-7e022d6e43b2/tree_of_savior_dungeons.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4790/3128/files/59867758693.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0699/4850/files/kajolekiwetemijobopobebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1748/6503/files/reussir_le_delf_b2_telecharger_gratuit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE0 4856 bytes
SHA-256: 339036000faaf9a7a606eb348e039c2aff138025e14bb3133bf3ddf20e40e24a
font_01_sfnt_off00007075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7075 9676 bytes
SHA-256: 0cf01433d08a27a837bd21367d40b28567b5f20e9297cfc24f6c1f5ab8a86468
font_02_sfnt_off00009139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9139 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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