Malicious PDF — malware analysis report

Static analysis result for SHA-256 e836058d3c4fbcb8…

MALICIOUS

PDF

41.6 KB Created: 2020-08-30 08:38:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af422fd018fbbfdcbcef7726aa02f594 SHA-1: 340bf0c69d9318c85d8ea79ca7c8bbf94a1d6d80 SHA-256: e836058d3c4fbcb86a231c7955598a005a6d20049245bddd83580f5730653523
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to a malicious site. No scripts were extracted from this sample.

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=you+don%2527+t+know+katelyn+tarver
    • https://static.usrfiles.com/ugd/aef5b7_f0e510101bd345c5ad566e9d6c152456.pdf
    • https://static.usrfiles.com/ugd/93c935_be8efe5edf8c426e8347b16fe0828e53.pdf
    • https://static.usrfiles.com/ugd/48d9a1_b6f8711af00d42df923d5458d60f9403.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/walking_dead_s07e02_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/fejeru.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/prefixes_and_suffixes_exercises_upper_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0437/7044/5975/files/wanubeseg.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/warigedadorusiropekezoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/6427/7657/files/94264622465.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/vusekenuliladakepuvif.pdf
    • https://cdn.shopify.com/s/files/1/0435/8547/0627/files/42816035124.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0492/files/frslag_p_mnen_till_informerande_tal.pdf
    • https://static.usrfiles.com/ugd/271e65_a144dbfc49cf46238d83453138b247cb.pdf
    • https://static.usrfiles.com/ugd/704566_4c54128e0e6e4d8d81ebaf7877af1355.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_off0000663e.bin
342f344f4dfe5eb946b8ae289789f3bff923b79da7f0abdf8d23ebd962f92c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663E 4952 bytes
font_01_sfnt_off0000774c.bin
520a7aa300754fc1c6e2f1d4c0ca1a2bac3eada947d4433d827bb3346554f805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774C 10532 bytes

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