Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b915a5b9aa67bd…

MALICIOUS

PDF

46.5 KB Created: 2020-09-04 19:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9268696e9d9a44d65066d24eca2ce10 SHA-1: be7f21a5f3a7cea4e3b24ab47e31fa31a1cda8cc SHA-256: f6b915a5b9aa67bd44adc94de028ec27c9d6ba47b2faa08613221d8e084956af
152 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.club'. The document body, though heavily obfuscated, contains the URL and text related to an 'Ask.fm like bot', suggesting a social engineering lure. The presence of numerous embedded links, identified as a PDF link farm, further supports the malicious intent of redirecting users to potentially harmful sites.

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.club/wix?keyword=ask.+fm+like+bot
    • https://static.usrfiles.com/ugd/e9cba9_993e03f666fe4c83a383c13fc8c0c326.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c129ede45344c8f9c428e1332799957.pdf
    • https://static.usrfiles.com/ugd/4b68be_0794fc16926a416fa86a5bf56a98c2ae.pdf
    • https://static.usrfiles.com/ugd/44b221_c5705a1b94134a88894840688ebad223.pdf
    • https://static.usrfiles.com/ugd/47b1e8_00fbeb762769477f9f18132802ce6674.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/luwefevadib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gasowezigubufavowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/61173058282.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_af97dbb8527d43a8a7ee8198e7cb9dfd.pdf
    • https://static.usrfiles.com/ugd/b8c837_473a88f600f445a1aba8ba4fff4a6b36.pdf
    • https://static.usrfiles.com/ugd/78c764_5f8732a01bb743ecaec194d897ac75ef.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_off000075ed.bin
06a2b8b4c2be7263c1738e0895717430d5e10386700754e4e9d09b4271ab2a3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75ED 4832 bytes
font_01_sfnt_off0000865d.bin
72a817906afd8f31286eac913b5ac712de6b6189f5c9cd121f87634aa0cf0826		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865D 11632 bytes

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