Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b604c6c76ac5e7…

MALICIOUS

PDF

31.9 KB Created: 2020-08-03 13:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ae0a9fd606ffd66e8622ab0468d7e1 SHA-1: 06670af6b1e06dfd29e8be7600fefb76b2e92536 SHA-256: 81b604c6c76ac5e78f077aeea04dd51bb17d5cec01ff09244aa89bff64458634
154 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.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a potentially harmful site.

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=proses+diagenesis+pdf
    • http://files.jasonhalf.com/uploads/1/3/1/4/131437308/totanemu-sisebuwoxofifin.pdf
    • http://files.actingcoachlasvegas.com/uploads/1/3/2/6/132681566/lejele.pdf
    • http://files.underneathiam.com/uploads/1/3/0/8/130874646/povegorebowapuj-buvogigowisu.pdf
    • http://files.longislandtu.org/uploads/1/3/1/0/131070469/715a7.pdf
    • https://cdn.shopify.com/s/files/1/0431/3592/6434/files/6965210923.pdf
    • https://cdn.shopify.com/s/files/1/0431/3340/3285/files/world_of_warcraft_rpg_monster_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/tunoxoluramosexavar.pdf
    • https://cdn.shopify.com/s/files/1/0438/3955/3696/files/54308098947.pdf
    • https://cdn.shopify.com/s/files/1/0430/5669/3397/files/98127106322.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/47824613008.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/rulokidaxizow.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/sumibovewuxesalutapaku.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3772/files/ganalixebesolojinaxawul.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/rosikusepawogebo.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_off000041ba.bin
7b74440dfbe15445baebb0508ba8549f17651a2f36711d189742eb9ec7932f8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x41BA 5176 bytes
font_01_sfnt_off00005364.bin
07b40d38704d3d182bbb0cfdc38f410d67c6b800f6767728b14f520ca10ba4b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5364 9328 bytes