Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c18175246e0cec…

MALICIOUS

PDF

42.2 KB Created: 2020-08-24 02:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f2f67a6204549a9b2e00b3d6140523c SHA-1: 2153acbe6983ad1427f03b6d45930c6514121e91 SHA-256: a0c18175246e0cecc581e0ce054a456ec4534c84f2a0c5784fedb75785bf7e56
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a link that redirects to a known malicious URL, disguised as an exam answer key. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this behavior. Additionally, the PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, suggesting a tactic to broaden distribution or mask malicious intent. No scripts were extracted, but the primary attack vector is the malicious redirector link.

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=ssc+stenographer+exam+2018+answer+key
    • http://vukok.tlkpowdercoatingmalaysia.com/uploads/1/3/2/3/132303382/14ee770a794035b.pdf
    • https://cdn.shopify.com/s/files/1/0429/6998/9279/files/printable_inference_worksheets_5th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/1779/6770/files/java_code_for_tic_tac_toe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8641/files/vuvafuditazenajazisif.pdf
    • https://cdn.shopify.com/s/files/1/0438/1753/3597/files/21416620975.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/kevenixomomakanewitix.pdf
    • https://cdn.shopify.com/s/files/1/0428/4363/5879/files/zedurivumo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3026/files/16559538645.pdf
    • https://cdn.shopify.com/s/files/1/0437/9115/5361/files/55173322692.pdf
    • https://cdn.shopify.com/s/files/1/0433/0776/1819/files/documentary_synopsis_example.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8932/files/warixex.pdf
    • https://cdn.shopify.com/s/files/1/0428/1620/9059/files/98109478533.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_off00006328.bin
994e7718c7c66294799d9d1adf674212f5b4e475de879079a1a1018ab3d64005		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6328 6264 bytes
font_01_sfnt_off0000785a.bin
e8f3a83129051fbe1507b5b6b228b4b410968792ae536cdcd4095f1fdc93c574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785A 10408 bytes

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