Malicious PDF — malware analysis report

Static analysis result for SHA-256 8568c101606c1728…

MALICIOUS

PDF

40.8 KB Created: 2020-08-17 00:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55e05231dbb55bca697f1a9d28637017 SHA-1: 16ce463d1a87b5a1132e29464c8cd2e3761908a5 SHA-256: 8568c101606c1728b0f21e85fe1640429acd3b0455f6859b184f665079c3af78
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with 18 external PDF links, including a redirector to malicious infrastructure at `https://ttraff.cc/pify?keyword=audience+segmentation+template`. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the redirector URL, suggesting an attempt to lure users to malicious content.

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.cc/pify?keyword=audience+segmentation+template
    • http://files.wallaroocampinghire.com/uploads/1/3/1/4/131406149/ketuxanekaxirot_kolebetavepa_zupenuxuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3434/files/type_a_blood_diet_food_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/3093/7751/files/ripogegud.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/fewajobubetevef.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7284/files/short_bedtime_stories_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0435/5204/7272/files/lokesowibososuxogekoxoneg.pdf
    • https://cdn.shopify.com/s/files/1/0436/5107/2153/files/map_of_europe_and_asia.pdf
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/wisalozolaradowujaxabew.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_off000063cf.bin
cd6c56210e3ddc05b4570b70c5c2e575d99c071c5ae494eabe8d3ed23b0c2b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63CF 5288 bytes
font_01_sfnt_off000075ad.bin
d9a108eb14c60f94d6f8e02172664733d715f244e913085a51bb391bc64499d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AD 9836 bytes

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