Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdd6fa3ba3032d4…

MALICIOUS

PDF

34.5 KB Created: 2020-08-29 03:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e46a52b983523039183475af5dca1dbe SHA-1: 8707cd0d2c33d55ba734e5ee06b15a1f20ad3f01 SHA-256: 1cdd6fa3ba3032d47d7a1882e2038b245ec61ce0bf15889b782e4ce86a8ab711
154 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/wix?keyword=plural+of+nouns+ending+in+y+workshee'. The document body, though heavily obfuscated, contains text fragments and the same URL, suggesting a lure. The presence of numerous embedded links, many pointing to Shopify domains, indicates a link farm strategy, likely to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=plural+of+nouns+ending+in+y+workshee
    • https://static.usrfiles.com/ugd/b8c837_554b718d21e64b4bb6c1b8ed6733f9f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_70b9141eab82439f9b62e8d9d77b190e.pdf
    • https://static.usrfiles.com/ugd/b8c837_375c03069b3d4bc0bc11542149eb8ceb.pdf
    • https://static.usrfiles.com/ugd/b8c837_bab4fb75bd07401dbd7e7bf39f9660f0.pdf
    • https://cdn.shopify.com/s/files/1/0435/3179/6632/files/tomb_of_annihilation_5e.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/17923629615.pdf
    • https://cdn.shopify.com/s/files/1/0432/2584/1819/files/wapuwugunemazubajevov.pdf
    • https://cdn.shopify.com/s/files/1/0440/2973/9173/files/47618671598.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6822/files/27036649258.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/98804830336.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/brand_guidelines_cost_uk.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/21526857624.pdf
    • https://cdn.shopify.com/s/files/1/0434/0324/7781/files/charter_club_damask_queen_sheet_set.pdf
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/660_am_ksky.pdf
    • https://cdn.shopify.com/s/files/1/0432/1830/5179/files/sepap.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/c_write_to_a_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/zukif.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_off0000497d.bin
7bdccd51292fd04a30965461a17f4fa229d1fce0350d1e2a3cd300c10ce1ae9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x497D 5428 bytes
font_01_sfnt_off00005bfd.bin
e5c7f0f29421a4d06573932a5023ed4bf49a334eaac17443af1df09b3d27358b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFD 9756 bytes

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