Malicious PDF — malware analysis report

Static analysis result for SHA-256 6149eb47ea6706ae…

MALICIOUS

PDF

42.1 KB Created: 2020-08-06 21:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dc30f703c8a649c53c9f12dd1c4dfd3 SHA-1: c404e41f55c3197595e757af8a2da56f402aeaed SHA-256: 6149eb47ea6706ae50f050be31d22a5735708c58dc1f32f8363d1ae390176621
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier strongly indicated maliciousness, and the overall structure suggests a link farm or redirection tactic to distribute further malicious 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=amazing+grace+piano+violin+pdf
    • http://files.alztrinbago.org/uploads/1/3/1/3/131380847/ff82b10ffd13.pdf
    • http://files.oldlinereferees.org/uploads/1/3/1/8/131871518/9202653.pdf
    • http://files.tampabaypoodleclub.org/uploads/1/3/1/4/131483281/zozenofanumeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wanojexabe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7746/7288/files/biosensors_for_medical_applications_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0438/0629/4176/files/58786994485.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/24340680067.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99237037604.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/gavok.pdf
    • https://cdn.shopify.com/s/files/1/0437/8014/5313/files/9158564753.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59577082877.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/kofabizorudoju.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/83158258686.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006623.bin
0d2cf941f73895441840d68ae7cf84f26358c1a9c4d79e2061c2a39780345e82
pdf-font-stream PDF embedded font (sfnt) at offset 0x6623 5396 bytes
font_01_sfnt_off00007879.bin
d6fbe13d9d1f30c73e408f5d03b6a38dc9899f0dfdc7bbe85003c21bbd0995dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7879 10364 bytes