Malicious PDF — malware analysis report

Static analysis result for SHA-256 133f135c87f9991d…

MALICIOUS

PDF

35.1 KB Created: 2020-09-18 01:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0367ef08b309f33a35f7d86e1a9f3da7 SHA-1: a3f71f23d2504ad592a6b590511535d745cdae04 SHA-256: 133f135c87f9991de8dc2c13e20314845a6e30e145b45984eb4ce0152c5e9c8a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO abuse tactic. One of the primary links, 'https://ttraff.club/wix?keyword=types+of+clay+pots+for+cooking', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating its central role in the attack. The ML classifier 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.club/wix?keyword=types+of+clay+pots+for+cooking
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2e0a1164-0806-4c67-b3b7-937f6cc3173a.filesusr.com/ugd/805d2a_f1b372afeb0d4bc088926869edbc3639.pdf?index=true
    • https://8695907e-47cd-4dc6-a4f9-d4ca5dc2a3d1.filesusr.com/ugd/fe0276_890645ac91784a959addbdb4d9b84c1f.pdf?index=true
    • https://e5bd2a94-17c1-4804-a6ab-ac52fe607eeb.filesusr.com/ugd/fedf23_9731ad7530f74b33bf9ea0bb12569d51.pdf?index=true
    • https://ba162e50-7e7d-41a1-a1ac-b7cafa8f2d52.filesusr.com/ugd/3f2390_b48ae2a8503942489b1079c84712dac7.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36281161478.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dijev.pdf
    • https://52ad8235-eba5-4978-aa04-5c08364afb4c.filesusr.com/ugd/162fe6_5e75528edaf64c578246d57a855703b3.pdf?index=true
    • https://116e1baf-0406-44f6-898d-e677c546913b.filesusr.com/ugd/98e2de_81e1412f301d42fcaff89feba1ae1233.pdf?index=true
    • https://352ce2a0-42f7-4c84-b173-63692d6a1d89.filesusr.com/ugd/2ca22b_230ac5a494e346668af557e47056dc28.pdf?index=true
    • https://eb75c662-e225-49cf-a366-9bc534988daa.filesusr.com/ugd/c88839_a1eb94d392364cb19663be39347b11ad.pdf?index=true
    • https://41f4339a-1b9c-446f-a37b-b196991d5f59.filesusr.com/ugd/1e32c2_5636fff786eb4bb888e5e17990701ba2.pdf?index=true
    • 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_off00004995.bin
b73c4ba10fec04896974f195e6c5c176b7f74caaf70386bad84741ea23c796a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x4995 5300 bytes
font_01_sfnt_off00005bbd.bin
b0f4e0cbca7a263c7f5ba268af7aedf53e3f970a6c7d0a30360cfecebe711d47
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBD 10788 bytes