Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e869d7e360268a8…

MALICIOUS

PDF

41.9 KB Created: 2020-08-01 21:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d50b2ff105adbb0afc1400af3e7b9032 SHA-1: 6891809c302b95cc0702ddf169310d1baf4bcc0f SHA-256: 5e869d7e360268a810a9e2352a2f8e61ec4c25f78797a8800e7fac5a1f005ec9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=171+cm+in+feet+and+inches, suggesting an attempt to redirect users to malicious content. The presence of a large number of external PDF links indicates a link farm or SEO manipulation tactic.

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.com/pify?keyword=171+cm+in+feet+and+inches
    • http://files.downtheroadfarm.com/uploads/1/3/2/6/132682913/dupemosijot.pdf
    • http://files.igottheshotphotography.com/uploads/1/3/0/7/130775102/kamepabizus.pdf
    • http://files.domesticviolenceunmaskedinc.com/uploads/1/3/0/7/130776041/0caf251448a410.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/rules_by_cynthia_lord_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/94764588603.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/339522980.pdf
    • https://cdn.shopify.com/s/files/1/0431/4369/2445/files/vijejelawapisevov.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/tecumseh_10_hp_engine.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gizazuvolabemonixodokij.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/linirowugukoros.pdf
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/joxibifiburo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8415/2986/files/1552620874.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_off0000616c.bin
5b121b83a1f5cff48e137d6ecae72967b43e05c9d8cd14df5b15ef98422c7d22
pdf-font-stream PDF embedded font (sfnt) at offset 0x616C 5172 bytes
font_01_sfnt_off000072e9.bin
88a14805b5d1365828e49b212d4501f903b63c116a9b196d00e41ce6dd55dfc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E9 12436 bytes