Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b736e2a56320f5…

MALICIOUS

PDF

44.1 KB Created: 2020-08-21 07:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4facfa55f49f79a34a2202ab9d9a3851 SHA-1: 5702be42fab5500fae53c9a3d98eeb5ff91207b3 SHA-256: 19b736e2a56320f5cc640aa3c281143177b11e15f48fb07a17a3d16f3492ff72
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document also exhibits characteristics of a link farm, with numerous embedded links pointing to external PDFs, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or redirection scheme.

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=report+contraband+cigarettes+uk
    • http://files.daphnefatterphd.com/uploads/1/3/0/7/130774979/pobizu.pdf
    • http://files.mindbodymovementarts.com/uploads/1/3/1/4/131407263/25030fbc1.pdf
    • http://wubiv.alexandriatalley.com/uploads/1/3/0/7/130775565/tejexexetanonot_lomudi_lobokojoxo_vatexiwes.pdf
    • http://files.resourcefulindonesian.com/uploads/1/3/2/6/132681634/3e04a07fbb.pdf
    • http://wedawiva.mindfulmilestones.org/uploads/1/3/1/4/131407995/73efae28edb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4953/4111/files/xalonakonorele.pdf
    • https://cdn.shopify.com/s/files/1/0430/3824/5017/files/35269358165.pdf
    • https://cdn.shopify.com/s/files/1/0430/1219/4463/files/event_planning_website_template_wordpress.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/flat_rent_agreement_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/4449/3720/files/1-_99_herblore_guide_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0436/6719/4021/files/82593821118.pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/88387527546.pdf
    • https://cdn.shopify.com/s/files/1/0429/2755/4723/files/99062213904.pdf
    • https://cdn.shopify.com/s/files/1/0433/7795/0870/files/94565656274.pdf
    • https://cdn.shopify.com/s/files/1/0431/6905/4886/files/wozilefametaj.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_off00006da3.bin
3bbe5d0635f8d674b668d8226dff3e12aa87fe7e596208e1c7323f0a51374283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA3 5420 bytes
font_01_sfnt_off0000801e.bin
de9b9f4ca1d29031a5a8b2fb4b86d93d735018f864c6881a6ae3a6bff1195d98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x801E 10536 bytes

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