Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dcd3ec64b42244…

MALICIOUS

PDF

47.2 KB Created: 2020-08-31 15:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64d5ca992008f1a982a0a21c3155bdfa SHA-1: 74a8ff42926ec6f5f92754f5ae01b30a65db5b23 SHA-256: a8dcd3ec64b42244112b65bd6a5290dc154b28aa84ae48a6d786de9c06f2a0be
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which points to a URL designed to lure users with a fake software download. The document body, though heavily obfuscated, contains the same URL. The presence of a link farm further suggests an attempt to manipulate search engine results or distribute malicious links broadly.

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.ru/pify?keyword=gsnap+autotune+vst+plugin+free
    • https://cdn.shopify.com/s/files/1/0433/7529/6677/files/bexefenijiji.pdf
    • https://cdn.shopify.com/s/files/1/0432/5975/6702/files/20792649253.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/big_green_monster_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0583/6438/files/libulikalu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5712/files/burubefidumakazelafidoju.pdf
    • https://static.usrfiles.com/ugd/22739b_251305e2a6f9474d8d2bc21046c42c9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0c90cec36e9447080397cc238479b82.pdf
    • https://static.usrfiles.com/ugd/234f58_a4782716c85c4dd8950b8fb91549b6dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_c53fce6494ad447ebf461da4fc0fe626.pdf
    • https://static.usrfiles.com/ugd/f4de5e_ea958b06d255442f9fc11c33822c6bbf.pdf
    • https://cdn.shopify.com/s/files/1/0432/6758/8252/files/69337408697.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/nimisovebalolokirevuwap.pdf
    • https://cdn.shopify.com/s/files/1/0437/2892/8920/files/94319056149.pdf
    • https://cdn.shopify.com/s/files/1/0432/7348/6496/files/first_grade_reading_worksheets_free_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000721b.bin
7bb352affcd8292619ddde47d0e493dfc74f8b48dce0d4f4960ee52010f1042f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721B 5160 bytes
font_01_sfnt_off000083c2.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C2 1800 bytes
font_02_sfnt_off00008c4f.bin
9ac9b35420ff33dedf29f6194e9e9b18cec79a09ff9b5553f480ae0cf2a77e15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C4F 10332 bytes

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