Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1bedf285976dc1…

MALICIOUS

PDF

43.0 KB Created: 2020-08-12 15:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 718f502c5685f4533b76db4a51b41ca0 SHA-1: 8b33c8b8108b42e91d4ed6a7601eed0a7263ab23 SHA-256: 3d1bedf285976dc15c36aa2d19c7294252a6420219d7eafce80ae935f177f5e5
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, which is the primary indicator of malicious intent. The document body, though heavily obfuscated, contains the URL that leads to the redirector, disguised as a link to 'basic english writing practice pdf'. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to attract victims. The redirector URL is the highest priority IOC.

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/wb?keyword=basic%20english%20writing%20practice%20pdf
    • http://files.fivehardfilmshow.com/uploads/1/3/1/8/131857916/5816439.pdf
    • http://files.cvgc1991.org/uploads/1/3/1/4/131410479/jawogisubukobudetev.pdf
    • http://files.happyhoundsk9training.com/uploads/1/3/1/3/131383251/3608864.pdf
    • https://cdn.shopify.com/s/files/1/0434/0226/4741/files/5754522891.pdf
    • https://cdn.shopify.com/s/files/1/0437/6117/2631/files/zobagujasajoligumuxaf.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/egg_biryani_recipe_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/67364140940.pdf
    • https://cdn.shopify.com/s/files/1/0430/0292/1123/files/wulanazibemexonetel.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/60189084791.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9520/files/star_wars_republic_commando_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0440/3088/6053/files/93232317740.pdf
    • https://cdn.shopify.com/s/files/1/0432/8492/2526/files/44053222082.pdf
    • https://cdn.shopify.com/s/files/1/0431/3215/8116/files/6263629195.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_off000069cc.bin
2a2e8c3071e719668c733e075f0922d12139a7a8f1b519d25d10f0ade9b2789e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69CC 5556 bytes
font_01_sfnt_off00007cb2.bin
c838cfb4d7277e7d28c16e75e76a0ecc71f2ac6dfa9f9693aa1c027667d4e83e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB2 10068 bytes

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