Malicious PDF — malware analysis report

Static analysis result for SHA-256 0662b277087536d3…

MALICIOUS

PDF

39.5 KB Created: 2020-09-01 05:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2675177e611dc3afd1f386bbb6f28044 SHA-1: 2640dc6c2f60fa15a0c4708bf811e5c40fc17e6f SHA-256: 0662b277087536d3000c0d4587702386cdc93f5ec0b9d7b6b6b7ea35ee3f5a4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'add watermark pdf online free'. It also exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external PDF files. The ML classifier strongly indicates maliciousness, and the document body, though heavily obfuscated, contains a URL that aligns with the redirector heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.me/wix?keyword=add+watermark+pdf+online+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/353d00_78f2705a7a7941e38b484577cd143ba1.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_d00e8e04e9e14e45b0eb2026aa5d826f.pdf
    • https://static.usrfiles.com/ugd/cfa91a_401dd900e0164e86817ddd5b8f4b34fb.pdf
    • https://static.usrfiles.com/ugd/b50c55_98c73c31cbdd4e4fbe3ad400be815f1f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e835c8c5d900456da26b5ef66bba75af.pdf
    • https://static.usrfiles.com/ugd/b8c837_8277e1711f864ea2bf9e8915656ae08f.pdf
    • https://static.usrfiles.com/ugd/f103bb_5e1b4485fd4a45ca82fd59cdab430445.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7d85ffc7e1344a5ac97b1d8aeef9855.pdf
    • https://static.usrfiles.com/ugd/06497e_842b9ad67602411fba79b39c4639410c.pdf
    • https://cdn.shopify.com/s/files/1/0438/3650/6272/files/labor_economics_george_borjas_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/49286783403.pdf
    • https://cdn.shopify.com/s/files/1/0430/0836/0611/files/car_alternator_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/free_adobe_photoshop_background_templates.pdf
    • https://cdn.shopify.com/s/files/1/0438/6357/2635/files/expanded_metal_lath_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/sephardic_haggadah.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bf9.bin
9ed7575adff78ad43e9ca216f71628516f8adac93a347b4a0ce15d3c0aecfc71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF9 5152 bytes
font_01_sfnt_off00006d83.bin
72949451dda6b0a9ab4e4edfaf9a116fd11508c9f2f53f4bd950ab034bd87bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D83 10444 bytes

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