Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ed9cc4cc934159…

MALICIOUS

PDF

52.0 KB Created: 2020-08-25 18:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b4711fe9a75bd18e9be2bfe051977e0 SHA-1: 091caed8f5946311f6f3b5f02533f45633d7f07e SHA-256: 71ed9cc4cc9341592ccdd4ed256c4ee4d7d9c771413a26d542809d0eb5175c4d
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 a link farm infrastructure. One of the primary links directs to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the target URL and a list of other URLs, suggesting 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=congruent+shapes+definition
    • http://files.levi-lehman.com/uploads/1/3/1/4/131452735/wesuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8303/8874/files/nizade.pdf
    • https://cdn.shopify.com/s/files/1/0433/8545/4750/files/how_to_get_footer_template_in_gridview.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/72995934723.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/lupigozuga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0433/4904/9494/files/vyapar_premium_apk.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/adams_tax_forms.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/depogasurijixisebajew.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/47053639244.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1602/files/79075030150.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/99947565250.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3791/files/65202079017.pdf
    • https://cdn.shopify.com/s/files/1/0430/9545/7941/files/kosesewokenatamarotife.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a0d.bin
03ab337d5ec9fa539ca3abcd5659ac90e22a7288c8e9eeeadc10ec44165d90bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0D 5176 bytes
font_01_sfnt_off00007ba2.bin
e487fd3c69384dd38c58f96aab3e3bfe1fa7112849efc9d8a9a1844786133271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA2 10400 bytes
font_02_sfnt_off00009f63.bin
b6a375b1d38f5b5e8ac66c8fad3f11852c7f5ab3e687b973d1e5f12c56475e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F63 16256 bytes
font_03_sfnt_off0000b4f0.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F0 4324 bytes

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