Malicious PDF — malware analysis report

Static analysis result for SHA-256 990499196cc02149…

MALICIOUS

PDF

50.2 KB Created: 2020-08-06 23:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c34ff3404cf3499788ae16f3fb12a58 SHA-1: 7a7758b927a50c8d4fa6faf568a334e14111b687 SHA-256: 990499196cc0214936ff0d77e0f2c5557343eba0b49bdda8ff75d0ec400ed7c3
120 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDFs, masquerading as calculus formulas, with one primary link redirecting to a known malicious domain. This indicates a social engineering tactic to lure users to a malicious site. The document body itself is heavily obfuscated but contains the primary 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.com/pify?keyword=all+differential+calculus+formulas+pdf
    • http://files.titansofbrahma.com/uploads/1/3/2/8/132815181/131938abd330773.pdf
    • http://files.6thairbornearmouredreconnaissanceregiment.com/uploads/1/3/1/3/131380213/35e89.pdf
    • http://files.kilocharlieshootingrange.com/uploads/1/3/1/4/131452903/1f028f812b82a6.pdf
    • https://cdn.shopify.com/s/files/1/0432/0935/9517/files/86030083546.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8913/files/17753854053.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46824776831.pdf
    • https://cdn.shopify.com/s/files/1/0432/9301/6222/files/fumisefibofuvonoliwes.pdf
    • https://cdn.shopify.com/s/files/1/0434/7320/7446/files/99_magic_guide_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/jokabufufatumamulopukas.pdf
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/47612495490.pdf
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/zojekibatakitezug.pdf
    • https://cdn.shopify.com/s/files/1/0434/1478/2104/files/kobewulil.pdf
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/funciones_del_nervio_vago.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/xaxolebilitu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/nulufovujajemurosatazib.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_off00007d66.bin
638a27c0c14ee2988ab5d0d5075c0517de30f7f377c5624799fb116040e69865		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D66 5288 bytes
font_01_sfnt_off00008f51.bin
f1341e6470bb3b39a2b923a7f7c32cac9c1f41b6d01d60b0b07a3718f61dd6c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F51 14344 bytes

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