Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8b022a6efb225b…

MALICIOUS

PDF

43.8 KB Created: 2020-08-08 07:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4066d7f4eb89fca4c26705581a302f11 SHA-1: 548ea9fbede4c9b6c99c5b8fa73b32c044f3c37d SHA-256: 5e8b022a6efb225b40df4f347a25629a1341a69bd7205a4b4ca251b0773a9c33
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, suggesting a link farm for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at "https://ttraff.cc/wb?keyword=artichoke%20benefits%20pdf", indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wb?keyword=artichoke%20benefits%20pdf
    • http://files.sewsewquilt.com/uploads/1/3/1/3/131380045/ee664f.pdf
    • http://files.spotonseamus.info/uploads/1/3/0/8/130814106/bedilib.pdf
    • http://files.tagalogshortstories.net/uploads/1/3/0/8/130874594/5771660.pdf
    • http://files.learnguitar4fun.com/uploads/1/3/1/8/131856381/8522082.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/3056/1436/files/17967382285.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4826/files/52928618006.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/cour_assainissement_urbain.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7418/files/33074561734.pdf
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/75163671279.pdf
    • https://cdn.shopify.com/s/files/1/0433/6861/1989/files/baroxoliwofogobivolo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0569/6407/files/php_contact_form_with_validation.pdf
    • https://cdn.shopify.com/s/files/1/0439/7580/3038/files/25350876363.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/guzizozewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/17577571855.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/55694596294.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006209.bin
79f456afe7ad265d9f0345bc8ebb052828c0a21b563385887349ab9b65d5d114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6209 4980 bytes
font_01_sfnt_off000072df.bin
88b462b248f9564a2fb6c061c771493c7d47ec2a2d26cd8d1091e603b0f0d30c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DF 9824 bytes
font_02_sfnt_off00009480.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9480 4324 bytes

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