Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f69f14e071191d…

MALICIOUS

PDF

51.6 KB Created: 2020-09-02 23:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cb254b0f57f1747839a1b3f26f15157 SHA-1: d5deae17b0da26f0a27d9a60579d4c5fe11c0821 SHA-256: f3f69f14e071191d6f3de4d07593cc11a47287bbc1154185dd5bf29be58b751e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=irs+carryover+worksheet'. The document body, though heavily obfuscated, contains this URL, suggesting a phishing attempt to impersonate the IRS and trick users into clicking the link. The PDF also contains a large number of external links, indicating a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=irs+carryover+worksheet
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/kakiloguwaruloxizizuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3665/5259/files/react_personal_website_template_github.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/60043858441.pdf
    • https://cdn.shopify.com/s/files/1/0433/3987/4462/files/1_8_pouce_en_mm.pdf
    • https://cdn.shopify.com/s/files/1/0437/4075/8170/files/19148158404.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/diccionario_espaol_kaqchikel.pdf
    • https://cdn.shopify.com/s/files/1/0448/1482/7677/files/tavanumawumon.pdf
    • https://cdn.shopify.com/s/files/1/0434/3922/7047/files/enzyme_catalase_lab_report_conclusion.pdf
    • https://static.usrfiles.com/ugd/b8c837_16f109af16784a0ba3310f4d05027548.pdf
    • https://static.usrfiles.com/ugd/b8c837_fcd4a41a79af447bb24ddede2b7f64e0.pdf
    • https://static.usrfiles.com/ugd/3b47cb_c2bd3a8ad82b449b9dea71f7e77061ed.pdf
    • https://static.usrfiles.com/ugd/cc3ca9_a79e54f98ac74698ab872bfa5c0eb87e.pdf
    • https://static.usrfiles.com/ugd/f84671_192f8555ac944e6784a4fb9ef713ca1a.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/65028343524.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/funo_da_acetilcolina.pdf
    • https://cdn.shopify.com/s/files/1/0438/7025/7320/files/83994637805.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_off00008a6d.bin
62a626b84be7339d6eca2c973428c5ffe02d8e4ced66e2986136d06ca75eb73e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6D 5108 bytes
font_01_sfnt_off00009be7.bin
6cbbb45b9a5678adeb6327fd8d89e1a6bfacdec9af20eb01b0abeeb5c0d6da5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE7 11120 bytes

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