Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c281d4e2d46eccc…

MALICIOUS

PDF

52.1 KB Created: 2020-09-12 22:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2348a474f9e950337a9deb790ca5257 SHA-1: ba3185cbf8d1b5f6faddda89d605e288c0d561e5 SHA-256: 2c281d4e2d46eccce9949110029bc28d6a50ba2e984efce09192bc2cdc90ca02
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is disguised as a "Gundam weapons magazine". This suggests a social engineering lure to direct the user to malicious content. The PDF also hosts a large number of external links, many pointing to static.usrfiles.com, indicating a link farm strategy. No scripts were extracted from this sample.

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=gundam+weapons+magazine
    • https://static.usrfiles.com/ugd/4b874d_f736258fa8024b77a120ba72b3ca40e2.pdf
    • https://static.usrfiles.com/ugd/2f7489_c8af81bbd3274fc4a632345121698a04.pdf
    • https://static.usrfiles.com/ugd/665c20_620f05f725954017920a10f9f458b4e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4aa6b52ad8c4f63ba4bd253b9a4b068.pdf
    • https://static.usrfiles.com/ugd/0c41e7_36c918687ab44c4fb8c364ce532f7441.pdf
    • https://static.usrfiles.com/ugd/2e79a6_dcdded5f27c045078dcf50b8002409ae.pdf
    • https://static.usrfiles.com/ugd/61c57f_014d9d67f85245779745530dfe432a89.pdf
    • https://static.usrfiles.com/ugd/a9248e_538e4f944a14430c83941cd3e531b086.pdf
    • https://cdn.shopify.com/s/files/1/0464/6492/5854/files/sateziwanidaduwaputa.pdf
    • https://cdn.shopify.com/s/files/1/0434/9162/3074/files/92673145871.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/mejewujojafizufafafuve.pdf
    • https://cdn.shopify.com/s/files/1/0431/0292/9047/files/gopavanazevifas.pdf
    • https://static.usrfiles.com/ugd/a7074a_c00053741b9e4489bf14a79603d5ef26.pdf
    • https://static.usrfiles.com/ugd/4c7633_b2bcbd81044e406e8e2722af6acff6fd.pdf
    • https://static.usrfiles.com/ugd/7f46b5_3cf9105b6d354d9bae3b36c41855194f.pdf
    • https://static.usrfiles.com/ugd/278743_b4910cccd87b4067a11e68559ac3adbc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000805b.bin
975c7f8cac99073babbf8475ad7c60f584016c6f029cb140a0d9e5f34d69025c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805B 3368 bytes
font_01_sfnt_off00008c5e.bin
335c022ef8f17672381050d12e9892b88c263af31c5159dc64aec900fdea46f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5E 5324 bytes
font_02_sfnt_off00009e89.bin
5c7faf148e16b405917d4edceffb88555e498ce99bec0bde7948d9a46e114395		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E89 10744 bytes

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