Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2878eb6bbab0f5…

MALICIOUS

PDF

41.2 KB Created: 2020-08-30 14:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca8135e1733efcc5896f8ea7371e4261 SHA-1: e417921967f366ed1a505ef866bc8d48b8ef5ac0 SHA-256: 8e2878eb6bbab0f567b02dfc7dbbc774413d8929ac15aeaa6cd97218181a8434
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm heuristic, with numerous links pointing to shopify.com domains, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. The presence of these elements indicates a likely phishing or malware distribution attempt.

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=autozone+hamilton+ohio
    • https://cdn.shopify.com/s/files/1/0430/2484/2906/files/calcutta_university_cbcs_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/18850702947.pdf
    • https://cdn.shopify.com/s/files/1/0427/4195/6775/files/76855061332.pdf
    • https://cdn.shopify.com/s/files/1/0438/6455/5680/files/free_antivirus_for_my_android_phone.pdf
    • https://cdn.shopify.com/s/files/1/0433/0926/9156/files/pajujuru.pdf
    • https://static.usrfiles.com/ugd/df4650_b0df7c4a9fdf4665a2fac6b5edbab0fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_07678323f78b4d569390d06684eff081.pdf
    • https://static.usrfiles.com/ugd/221f3a_eb1537828a7f426aaeb33324a85ba191.pdf
    • https://static.usrfiles.com/ugd/73c254_d4a7f39026bb447888d6fefffc98c4a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f72ec573f884ae893bda899ac3d085f.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1340f1607743f594209bed08f197e5.pdf
    • https://static.usrfiles.com/ugd/b8c837_be3b6c19ec5842778bde5634da6edbf4.pdf
    • https://static.usrfiles.com/ugd/4bb894_20e656543b5c4dbb9b43d42d36c2c427.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/94787364290.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2338/files/zevosiw.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_off000065e0.bin
e02a54b58130efdf3382d077bc61ad400c86fa98de33951344caa3050fa29cae
pdf-font-stream PDF embedded font (sfnt) at offset 0x65E0 4688 bytes
font_01_sfnt_off000075aa.bin
9e998a5bae39778718162010587cb8c0f9a4f80d2ebec9fbf77eb3b781e2ef34
pdf-font-stream PDF embedded font (sfnt) at offset 0x75AA 9984 bytes