Malicious PDF — malware analysis report

Static analysis result for SHA-256 729bd8665118149b…

MALICIOUS

PDF

43.6 KB Created: 2020-08-11 04:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b868002e5af82dc16f696b00c32efd77 SHA-1: a7180266247d0bb8749f78909854c4fc051a755e SHA-256: 729bd8665118149b068c0ca5bf4d39346c301c4e303366171304c339b50752fc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which are algorithmically generated and point to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector infrastructure, https://ttraff.com/pify?keyword=asvab+paragraph+comprehension+pdf, which likely serves as a gateway to further malicious content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=asvab+paragraph+comprehension+pdf
    • http://files.icttg.com/uploads/1/3/0/8/130814205/7126333.pdf
    • http://files.treekintrove.com/uploads/1/3/1/3/131381679/fujabav_pawatififuva.pdf
    • http://files.greateragapedeliveranceinternationalchurchinc.org/uploads/1/3/2/7/132710783/2119179.pdf
    • http://zivavif.grassyknollfarm.com/uploads/1/3/1/0/131070718/27bdc089.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/bogaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/pesiwedos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9780/1375/files/pozipetuxivawetobikibi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/54774854414.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7777/files/9983839650.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/77812385315.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/biocontrol_agents_and_biopesticides.pdf
    • https://cdn.shopify.com/s/files/1/0429/3240/4380/files/tuxosulewedazas.pdf
    • https://cdn.shopify.com/s/files/1/0428/7945/1295/files/you_can_t_hurt_me_david_goggins.pdf
    • https://cdn.shopify.com/s/files/1/0436/1050/5373/files/95397339293.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/xuwanesufiraguruposox.pdf
    • https://cdn.shopify.com/s/files/1/0437/4783/6065/files/malos_habitos_alimenticios_en_universitarios.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_off0000698f.bin
fe3d26fde4682772f507ea52f3d72cd7510f5c0812f66f4b767dcaebe6b561aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x698F 5728 bytes
font_01_sfnt_off00007ce0.bin
1fbad2c0e055be51ac1f865a524c41eb98a3631c5172e87894698b676a28ed2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE0 10688 bytes

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