Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a161816c464a43…

MALICIOUS

PDF

55.9 KB Created: 2020-08-21 23:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c5828cb2de5af3f81c0f1484d5df3509 SHA-1: e67c755147c849ceca3d512da10529f5503d878f SHA-256: 18a161816c464a4388e564645ea00aadbb837ff928508e975d485e8467d866b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document also exhibits characteristics of a PDF link farm, with numerous links pointing to external resources, many of which are hosted on Shopify. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure users to harmful content.

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.com/pify?keyword=movimiento+circular+uniforme+y+no+uniforme In PDF document text
    • http://wozaxonu.vicjuniorxcski.com/uploads/1/3/1/4/131438572/bumilafomukifisefeno.pdfIn PDF document text
    • http://doduva.sailonsounds.com/uploads/1/3/0/8/130874674/ab47a950e25.pdfIn PDF document text
    • http://xowuwu.jingyouecon.com/uploads/1/3/0/7/130740206/tujokuratedexu.pdfIn PDF document text
    • http://files.voodoodollbookblog.com/uploads/1/3/1/4/131438809/434e8b94d6147.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/1/0438/1959/7981/files/38149866633.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9277/8912/files/lipagigoligukamunenapiwix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3300/1126/files/firewirogadorivunuwew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6299/2795/files/remove_wix_banner.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/mukesidin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2122/8440/files/credit_reference_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0392/6938/files/demosijanovege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/4337/3480/files/77370113094.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4376/3862/files/26041986569.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/integral_calculus_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/6138186179.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2839/7728/files/98747395.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0B 5016 bytes
SHA-256: 8fa6840c845474c68827a3f90a1a3d37c39052cb6493890585dbafe012dc4f0e
font_01_sfnt_off00008b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1F 15692 bytes
SHA-256: 1f875c8f6ae3876b997dcc78b1175ac117b3c4b3c23f49b66455b220b3e8318c
font_02_sfnt_off0000bb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB49 16132 bytes
SHA-256: 9b97140b008b01881401b3ef1b08a6db1890ded358373a8abebab54fad7abd63

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