Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b7c0b85371a9f8…

MALICIOUS

PDF

42.5 KB Created: 2020-08-10 05:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7da5d88f1be18016e8aa9bfe3844b6eb SHA-1: ef83b910da8ef54890f7410d58e3691af9e0b5ff SHA-256: e2b7c0b85371a9f866024585874ec86c660cfec1533091d1b104b6265fbb3055
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to PDF files hosted on Shopify. One critical heuristic indicates a malicious redirector link, specifically 'https://ttraff.cc/pify?keyword=b.+com+cbcs+syllabus+pdf', which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to 'cbcs syllabus pdf', suggesting a lure to disguise the malicious intent. The primary attack pattern involves tricking users into clicking a malicious URL.

Heuristics 3

  • 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.
  • 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=b.+com+cbcs+syllabus+pdf
    • http://files.wolfmatters.org/uploads/1/3/1/4/131438823/supopufawe.pdf
    • http://files.iguazufallstour.net/uploads/1/3/0/8/130814284/zolesekiketodosazad.pdf
    • http://famesol.dancetemplesaltspring.com/uploads/1/3/2/7/132741334/tajupif_sevogij_tajefiboxo.pdf
    • http://nerasa.yiukwongchung.com/uploads/1/3/1/6/131606490/pasegazosotal_mozekorulon_tegesi_xujozaxo.pdf
    • http://sakanit.nbgc.org/uploads/1/3/2/6/132681559/nirafere-nunabixokezika.pdf
    • https://cdn.shopify.com/s/files/1/0438/0613/0337/files/8129876175.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/33619176452.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/72801822971.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.pdf
    • https://cdn.shopify.com/s/files/1/0429/6251/8182/files/kuxukovifiretadatulotuwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8176/0935/files/calendario_escolar_2020_19_sep_oficial.pdf
    • https://cdn.shopify.com/s/files/1/0437/1746/0120/files/14234546464.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95909873105.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6594/files/best_editing_app_for_ipad_pro.pdf
    • https://cdn.shopify.com/s/files/1/0439/6105/7438/files/gepalem.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006809.bin
c24f0ef47f6bd7cd0e29977b2e43b0a0eab2813458289b94dc379500607c33c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6809 5528 bytes
font_01_sfnt_off00007ad4.bin
23c7505145d0d8e32a346f02bf1705a4cd8f9e2be0e789855f8d0cda129f2ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD4 10300 bytes

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