Malicious PDF — malware analysis report

Static analysis result for SHA-256 196341c8fbdc406a…

MALICIOUS

PDF

46.7 KB Created: 2020-08-31 10:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c96bf7426ead486ec196bb1d28c89849 SHA-1: d4a13cb19387e93c192bc71aaffcf9da1354e411 SHA-256: 196341c8fbdc406a5ec25f5a73a98825b0986ae89a156d88f9e4dbcb4a3e7dae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious content. The presence of numerous external PDF links further supports the 'link farm' heuristic, indicating a potential SEO poisoning or traffic generation scheme.

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=calisthenics+training+program+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/590778_0665e829dad04beb92a8cd12dc7f589d.pdf
    • https://static.usrfiles.com/ugd/f46427_a0df3bfa0b3946179627745c0864dc25.pdf
    • https://static.usrfiles.com/ugd/b8c837_b92c904487cc4e9981450bb482de60a9.pdf
    • https://static.usrfiles.com/ugd/f84671_030eca095b304ad8ad7243b51df6e113.pdf
    • https://static.usrfiles.com/ugd/fe83c3_b79189b2038e4e90b3fd9f29e299f854.pdf
    • https://static.usrfiles.com/ugd/cec570_9c468edb44b14e80b36e8eeeacf95d11.pdf
    • https://static.usrfiles.com/ugd/d1c05f_c48b96ecf07e402eba24e8aae1018034.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e8e8454c5ca4b17a035b86919f28ad0.pdf
    • https://static.usrfiles.com/ugd/b8c837_580575a57c014bba9314d1ad3098713d.pdf
    • https://static.usrfiles.com/ugd/23e9be_e5d835e8898648bf9229d82782c1cbd1.pdf
    • https://static.usrfiles.com/ugd/2ca09c_c4e28bcec3b7403f886bfeab83f188af.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d8ebc9eb9a54044a206f993f0b7e1a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_f09e7c95316f4fa48aca75a811768719.pdf
    • https://cdn.shopify.com/s/files/1/0429/9928/3861/files/luwozoboz.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/assinatura_digital_gratis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006af0.bin
6fe7d4a9603abb2b8d1ccbbe26226b8413a4339656e42f5640084c85d64151fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF0 5380 bytes
font_01_sfnt_off00007cfd.bin
d369aa0473776b0ae077324168a480b3264b42883f76e2a9899960dc15dad7fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFD 10204 bytes
font_02_sfnt_off00009fa0.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA0 4324 bytes

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