Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f653fef443da48…

MALICIOUS

PDF

33.2 KB Created: 2020-08-06 14:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1caf71cc4f82d5e98d89162f01aece40 SHA-1: d71fae2297a816809ee0331611b10b1607fb28b2 SHA-256: 17f653fef443da48f120bdf722fbf8cb0bca85820d79bc6d701c0dfb8f0d2f3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources. One of these links, 'https://ttraff.ru/pify?keyword=cambridge+english+business+benchmark+advanced+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, contains similar URLs, suggesting a coordinated effort to direct users to malicious infrastructure. The presence of a link farm and a malicious redirector indicates a phishing or scam attempt.

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=cambridge+english+business+benchmark+advanced+pdf
    • http://files.ridgecrestelementarypta.org/uploads/1/3/1/4/131408465/kexedi-kabope-biduvatujef.pdf
    • http://files.phmiinfo.org/uploads/1/3/1/8/131857655/5b0dd34c7.pdf
    • http://files.shelbyanngiftsanddesign.com/uploads/1/3/0/7/130739885/d7e8cc3a4afb.pdf
    • http://files.badgrrlbrenda.com/uploads/1/3/0/8/130814017/jowuras_masagenivuxu_dujona_xafelap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/19051498657.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/77867857329.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/woxarobazibenilezewafokok.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/tukozitilewava.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/37090514350.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9547/files/15572030490.pdf
    • https://cdn.shopify.com/s/files/1/0435/8458/5883/files/intex_saltwater_system_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0432/7214/3001/files/55329923599.pdf
    • https://cdn.shopify.com/s/files/1/0440/6778/2821/files/bagagofar.pdf
    • https://cdn.shopify.com/s/files/1/0436/8374/1849/files/dakoxatisutakuwevupavak.pdf
    • https://cdn.shopify.com/s/files/1/0428/5192/6183/files/capital_structure_formula.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0938/files/sutin.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_off00004451.bin
d22ca1f5ca458d3f5c565af78dfd6bac47f4279d89d9f3c0bccdec48b17b3f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4451 5736 bytes
font_01_sfnt_off000057aa.bin
03bce44b1a3f829ac22633b8be60534b680d1637610b99894185505092d62c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57AA 8916 bytes

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