Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ce5d035bf078a1…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 20:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29d4c6c9bf196a724b3a88e8aad43e9e SHA-1: 7c52e90bf369b1d106c3bb1f98c5742730a15643 SHA-256: 80ce5d035bf078a1c49f6452847803d1d132d377b3c78752cd5c258c338d6eb9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though partially garbled, contains text related to 'answer key flyers' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links, many pointing to Shopify, indicates a link farm SEO tactic, 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=answer+key+flyers+1+2018
    • https://cdn.shopify.com/s/files/1/0430/7209/4362/files/partial_differential_equations_canonical_form.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/bigekiwaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4330/files/58033051519.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/12906519372.pdf
    • https://cdn.shopify.com/s/files/1/0428/3006/9927/files/dobarimume.pdf
    • https://static.usrfiles.com/ugd/5a1791_f246f4da6a0041148391a9edd36c725b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a9e319c0919441899b43172727d5cb5.pdf
    • https://static.usrfiles.com/ugd/a18aa6_6339673ca90944c9a878627c4b08065f.pdf
    • https://static.usrfiles.com/ugd/c63dba_63dd1cfe459945ec8c9a051184dc0555.pdf
    • https://static.usrfiles.com/ugd/003b86_0e1bbed814bc4f83a125643ad0317abb.pdf
    • https://static.usrfiles.com/ugd/b8c837_847af44f1b3546cfb31964275fee38e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_9ffcf9ed37a74a1ca5b53f7df05241fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_c754b328eb0644a0abb523258e514f11.pdf
    • https://static.usrfiles.com/ugd/89363e_31b445298f5742febcfffec8b6ca7076.pdf
    • https://static.usrfiles.com/ugd/b8c837_250c8889548e4b2fb66aed7fd1bd1af5.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92c904487cc4e9981450bb482de60a9.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045d9.bin
d8da8393a3ad4df8b57f200e7cf23b92d6daee5acbe104f51edb17c83f5ab7e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45D9 4868 bytes
font_01_sfnt_off00005672.bin
6c82cec137e7ddb64633229e6194c82aeda9b74d520242550b9dca2d5d80a1f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5672 7104 bytes
font_02_sfnt_off0000697f.bin
9ae04bf976bd7de8a171fb84f5d7df3903a89476a97439d196b1a3ed7356e134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x697F 9444 bytes
font_03_sfnt_off000089ce.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CE 4324 bytes

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