Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7eba527c996150…

MALICIOUS

PDF

47.7 KB Created: 2020-08-08 22:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e6ef8fd52e24e9cb5bb210da4823d3d SHA-1: 1d5b00dbdb820fb02cf8e9b6f2e9e26ce9fa65e1 SHA-256: 6b7eba527c99615033fa90ffaaf8f53cd0ab3416a26bebfc526d6a1280a76855
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm designed to trick users into downloading files. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution 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.cc/pify?keyword=alternating+current+pdf+free+download
    • http://files.itanecoleman.com/uploads/1/3/1/4/131437318/3061225.pdf
    • http://takodez.nfpsolutions-now.com/uploads/1/3/0/7/130740510/dotipetoseb-safodasujukub-dopasodafogod-tigaligesamonu.pdf
    • http://jidisu.nataliekfit.com/uploads/1/3/1/4/131407406/tanajegokiloporudof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/0159/3502/files/paviwodimezokeludulidi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/negopolikutowuz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9853/8151/files/97265310383.pdf
    • https://cdn.shopify.com/s/files/1/0429/0360/1308/files/anemias_oms.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/porovurujapiganipuzul.pdf
    • https://cdn.shopify.com/s/files/1/0432/3160/8989/files/zimanizinizixulep.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/jedoradorokimutawolitiva.pdf
    • https://cdn.shopify.com/s/files/1/0437/0402/5242/files/66359480708.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/67159962052.pdf
    • https://cdn.shopify.com/s/files/1/0436/0726/1341/files/blackfathom_deeps_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/0161/8330/files/mafilu.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_off00006eb4.bin
84d8302890b2b1a2005298d19ba5aff32cbbfb26ff98a03ff967fbefcad06c86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB4 5108 bytes
font_01_sfnt_off0000802d.bin
4cf22101d8fe463fa39060625014d19a1a5fd77ba5159d4e392a14199f661f6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802D 10324 bytes
font_02_sfnt_off0000a32d.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA32D 4324 bytes

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