Malicious PDF — malware analysis report

Static analysis result for SHA-256 633f6eaa4bd38eff…

MALICIOUS

PDF

104.1 KB Created: 2020-08-08 05:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3fc0eac2e6005063899aa1054296582 SHA-1: b869a4027c9e8c9a59f8813f0fd763106d3ce4aa SHA-256: 633f6eaa4bd38eff76c6f3caed34cb5de3baaea5bf718fd6767eaf49edd55fd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, identified as a link farm, which is a common tactic for SEO poisoning and distributing malicious content. One of the primary links directs to a known malicious redirector, ttraff.cc, suggesting an attempt to lead the user to a harmful site. The ML classifier also strongly indicated maliciousness.

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=problem+solving+approaches+pdf
    • http://files.techrox.org/uploads/1/3/1/4/131407361/zuredolu.pdf
    • http://files.americanlegionpost555.com/uploads/1/3/1/6/131606822/3554526.pdf
    • http://files.3fishproductions.com/uploads/1/3/1/1/131164382/kurovobi_lasosapikof.pdf
    • http://pejakowa.funkythai2go.com/uploads/1/3/1/3/131398591/toxubirusoni.pdf
    • http://files.gianatiempogallery.com/uploads/1/3/2/7/132712206/xadanamesuma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/walbro_carburetor_adjustments.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/biology_exploring_life_online_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/media_query_breakpoints.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0850/files/aerodynamics_anderson.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6944/files/technical_interview_questions_and_answers_on_c_c_java.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/zovogotekutetavaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/6428/6618/files/22254777053.pdf
    • https://cdn.shopify.com/s/files/1/0430/6835/8807/files/5905555228.pdf
    • https://cdn.shopify.com/s/files/1/0433/1313/5774/files/10947100812.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2311/files/xudixelajojovowilapolan.pdf
    • https://cdn.shopify.com/s/files/1/0433/6661/3141/files/aeronautical_engineering_subjects_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/8374/2884/files/65993940200.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c45.bin
98e7c52f6d375d46edc20822cc8b2a6d0b412e0e712e8b7f554bd51da3b92a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C45 5480 bytes
font_01_sfnt_off00015eae.bin
bb916f6a7a30a4319f633f3e291292f242574f464c2d15b460cb278d859df29b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAE 11224 bytes
font_02_sfnt_off000184ce.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x184CE 4324 bytes

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