Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9c8f8c4a63fb28…

MALICIOUS

PDF

37.6 KB Created: 2020-08-14 12:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6831f0824dc16cf35b5c5f0f3612151a SHA-1: 53e95fc17eb096c869929e78effe7fd1b2b09781 SHA-256: 3b9c8f8c4a63fb28e3d66ed59a8270a418d9ac435b88de95374f0c2fa60d1ed5
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to a 'biology quiz pdf' and includes the malicious URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely to obscure the malicious destination. The primary malicious IOC is the redirector 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.com/pify?keyword=branches+of+biology+quiz+pdf
    • http://files.acuityworks.com/uploads/1/3/1/3/131379748/6c253247d5ed.pdf
    • http://files.ovalaboratories.studio/uploads/1/3/0/8/130873741/07e1acf5578f.pdf
    • http://files.shinyaxe.net/uploads/1/3/2/7/132740343/7506111.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7932/files/hl_2280dw_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6746/files/57388173553.pdf
    • https://cdn.shopify.com/s/files/1/0431/3651/6250/files/warifija.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/81003138999.pdf
    • https://cdn.shopify.com/s/files/1/0433/9374/5046/files/76470400637.pdf
    • https://cdn.shopify.com/s/files/1/0437/7935/8869/files/beautiful_disaster_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0431/8878/1219/files/dexiluxalenetorawobekor.pdf
    • https://cdn.shopify.com/s/files/1/0438/9981/4040/files/english_grammar_bangla_version_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/xunejubazekikol.pdf
    • https://cdn.shopify.com/s/files/1/0428/3187/2166/files/thermo_king_apu_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0441/3282/7288/files/8595240604.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_off00005343.bin
eb3e9cfe1be2ead99f9e24cf06f129c1c1a5d3b001d57c18fe32ed15838f206b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5343 5884 bytes
font_01_sfnt_off0000673c.bin
54d621bb5cb5dc348f53852e3b6f7c8057ef5c0eb29435c44a9c9564ebc75eea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673C 10284 bytes

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