Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a59232a3a9ebdc…

MALICIOUS

PDF

44.3 KB Created: 2020-08-28 20:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0b0f0e37f7202c710972167991d5686 SHA-1: 5055a29daa215f609017d678041ee894c5f49b61 SHA-256: 55a59232a3a9ebdc7149ac124dea9e4647ba75c59cc6040e5c2aca8bb150df9e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=blount+university+of+alabama', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links pointing to a PDF link farm, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=blount+university+of+alabama
    • https://static.usrfiles.com/ugd/b8c837_beaf0f4ae0944100b8047c300d0beb16.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cefc7238c4540a884b66f684e1a503d.pdf
    • https://static.usrfiles.com/ugd/b8c837_11734de3b77c411581461eb84533a23e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6454569ec054182aca7b573c3613ff6.pdf
    • https://static.usrfiles.com/ugd/b8c837_03c0f31937d141bfbe664aea726c2791.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa60f998f3ca46a0a3a5118adb8edc6e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f9041e3a4ecf47f2bb1f5f26774a73c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c9b3ba46b3143a5a3cb622ac9fb4cc7.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/49388976041.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/communicate_in_english_class_8_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/tibakifutepid.pdf
    • https://cdn.shopify.com/s/files/1/0439/9982/1982/files/valvulas_ksb.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0a6355140284d5ea78165582bcba1ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_41739e46bade405d8169c1762424a5e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_daf4ec05f5bf402faf6d38e30f2777ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_a33d3cda790a4d43ba951291a5ab1ebf.pdf
    • https://static.usrfiles.com/ugd/b8c837_077801986ce341a8858c1d3b0c43f43f.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e02.bin
284202f9a463ea7df79e2ce91ff9fd602c7619f3890e9d1f638cfcd0783a410e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E02 5264 bytes
font_01_sfnt_off00007fe2.bin
bb845da4eba0fd24903a5fa3a5ce5800c84574677a128d59c1581bc415c26b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE2 10664 bytes