Malicious PDF — malware analysis report

Static analysis result for SHA-256 142b502b1a108e46…

MALICIOUS

PDF

37.4 KB Created: 2020-08-25 07:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3ee690f96d0c7bce3faac0d8066e336 SHA-1: 6158db8f5baf441f2b977a3d212c7c0e1e18c8fd SHA-256: 142b502b1a108e46fd6acfba493377b970592b0541584dad339575d4ac298609
154 Risk Score

Malware Insights

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

The PDF document contains numerous links, including one pointing to a known malicious redirector infrastructure at "ttraff.ru". The document body, though heavily obfuscated, contains text that appears to be a lure for "Foxit reader for mac", suggesting a phishing or social engineering attempt. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL is a high-confidence indicator of malicious intent.

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.ru/pify?keyword=foxit+reader+for+mac
    • http://vaguv.myamandarogers.com/uploads/1/3/2/3/132302921/dodifitenuguzafipole.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/8307/9592/files/15725324614.pdf
    • https://cdn.shopify.com/s/files/1/0428/0107/0247/files/nedesuxexutosiwo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0920/files/walumimupumonugole.pdf
    • https://cdn.shopify.com/s/files/1/0434/8208/7576/files/wadotulubolubiwupekinekez.pdf
    • https://cdn.shopify.com/s/files/1/0429/5809/4495/files/95438792490.pdf
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/22656633551.pdf
    • https://cdn.shopify.com/s/files/1/0432/3160/8989/files/36536091582.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/55772371025.pdf
    • https://cdn.shopify.com/s/files/1/0454/6071/7726/files/zoology_handwritten_notes.pdf
    • https://cdn.shopify.com/s/files/1/0466/7952/3493/files/piano_sheet_music_to_hallelujah.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/67715277791.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/88339197587.pdf
    • https://cdn.shopify.com/s/files/1/0434/2703/7336/files/mopupuzu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/84381464882.pdf
    • https://cdn.shopify.com/s/files/1/0434/8067/8557/files/dfinition_des_maladies_infectieuses.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_off00004abb.bin
866255f8b016ef06f6bb8f60c14901427f033b0c43be529e7ebaf5db628f659e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4ABB 4664 bytes
font_01_sfnt_off00005a96.bin
cf827903647841edd7dc024e1e18f788a67e4a565ef4d5d7105d6ac538c053ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A96 9512 bytes
font_02_sfnt_off00007b0f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B0F 4324 bytes

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