Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64253003d9d58e2…

MALICIOUS

PDF

61.9 KB Created: 2020-08-14 05:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7edbbfa619ec0f859809ab0c690c83ac SHA-1: 8f1556dbf41bee1f8de73af37ec0e82894196397 SHA-256: b64253003d9d58e25860a14755be854be6515fb3181399cb0cc48b305c2b0703
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=ielts+writing+task+band+9+pdf`. This URL is likely part of a phishing or scam campaign, using the guise of IELTS preparation material to entice clicks. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The primary malicious 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/pify?keyword=ielts+writing+task+band+9+pdf
    • http://files.lennoxwarner.com/uploads/1/3/1/3/131378975/ad9ad45c57236b.pdf
    • http://files.catalystipf.com/uploads/1/3/1/6/131637125/534992.pdf
    • http://files.windmillpreschoolbrill.com/uploads/1/3/1/3/131381919/3182821.pdf
    • http://ronupuzo.wellbridgehealthessentials.com/uploads/1/3/0/9/130969352/fanisep_sofike_fuzuvelenid.pdf
    • https://cdn.shopify.com/s/files/1/0434/7166/7352/files/22466437779.pdf
    • https://cdn.shopify.com/s/files/1/0434/3899/7665/files/xojogepofixalubifep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32852202686.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/notarized_letter_templates.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vevisip.pdf
    • https://cdn.shopify.com/s/files/1/0433/9345/0134/files/33945871919.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/zixop.pdf
    • https://cdn.shopify.com/s/files/1/0438/9689/7704/files/dafojobojezivulexuwifiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/tamewaruvelovuker.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70998441087.pdf
    • https://cdn.shopify.com/s/files/1/0434/7458/3709/files/bid_bond_template.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_off0000b458.bin
619703e8b7cea9eecc538d4fba68046e60665b42b9d0936a4a0a57e1dbde7eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB458 5600 bytes
font_01_sfnt_off0000c77c.bin
005d2ba52210d3f67f0c7049ba1eee337602f82e10d77fe5a597d95355e15519		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC77C 10360 bytes

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