Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b6f94e9bf1121b…

MALICIOUS

PDF

44.5 KB Created: 2020-08-31 01:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc9afee88c7a32556c0904cec1bcb04a SHA-1: 0e33d58b326a3a56a5952b656defdf0c348c904d SHA-256: 63b6f94e9bf1121bbfd73449b7d46c03059fe41794ab7d7291d9360563ac3694
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the malicious redirector URL and numerous benign-looking PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness.

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=beowulf+study+questions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3727/7855/files/akhiyon_ka_yo_kajal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/berujixawajibexuxutuzogar.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8474/files/star_jalsa_tv_serials.pdf
    • https://cdn.shopify.com/s/files/1/0439/1891/7787/files/18827179710.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1048/files/nikaxijirifurozowupe.pdf
    • https://static.usrfiles.com/ugd/b8c837_4df433b46edd42d29a302c0e14811c5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_22f20fd1762a4057ae04fd19e1d84c00.pdf
    • https://static.usrfiles.com/ugd/bb13a2_e56c061f6259416cbb94a886b4f0e215.pdf
    • https://static.usrfiles.com/ugd/23e9be_6094e192e0664086b5df452dcccb1be8.pdf
    • https://static.usrfiles.com/ugd/73c254_03688344d5fd40b1920f6c79597f52c4.pdf
    • https://static.usrfiles.com/ugd/2274a7_474114f0853f49a4b0c72f21f9b563a8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071ce.bin
a489362713d43238026cdb5cec4688512a2abac61f8c48f86038b0506b7f0310		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CE 4964 bytes
font_01_sfnt_off000082e2.bin
56d9463539afe54fcb4096441d01b3bd74bf417a145498ceeabd58284bbc3d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82E2 10120 bytes

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