Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c2d51e8a47953e…

MALICIOUS

PDF

48.7 KB Created: 2020-08-30 05:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73553467924fe2909f463312123ba52c SHA-1: 04f83915ea0a053a6ed16c1b759f11b9557d2c04 SHA-256: 76c2d51e8a47953efd1ce5401543d5b42ee8e5f3b025f38c43b4089abc8058ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Silent Hill' and includes the malicious URL. The presence of numerous external PDF links, many of which are benign, suggests a link farm tactic to obscure the malicious destination.

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.ru/wix?keyword=silent+hill+bathroom
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b42e3caae41f4ed29fa47b2e6b09220b.pdf
    • https://static.usrfiles.com/ugd/b8c837_110c79b8908b454a9ee1c9be8551d9c2.pdf
    • https://static.usrfiles.com/ugd/1cfe37_1e6adcfc6c84465ea5a0c6ec65bd3fc8.pdf
    • https://static.usrfiles.com/ugd/3826db_e0f40d4b419449068c3c6669a8a8138d.pdf
    • https://static.usrfiles.com/ugd/804ff6_3429ae9552754d9f8c8e4cf99cc25b3c.pdf
    • https://static.usrfiles.com/ugd/de02f3_26c581cc2ab745fb9476d7c8b056947c.pdf
    • https://static.usrfiles.com/ugd/f0e51d_0a52f453fdbe43fab5eee2140767701e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5fdf1e2391744ed851fe6f5b12bb720.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9559/files/requiem_memento_mori.pdf
    • https://cdn.shopify.com/s/files/1/0439/1793/4747/files/iluminacion_espiritual.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_off00008332.bin
d4bd9c81a6ffa125e90be2b76bb1ae92e6c9a79fbbd2ad92c76e33f3958a1f50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8332 4992 bytes
font_01_sfnt_off000093f5.bin
7641b2e3b3fbe03284cb3ae3c25ecc16f733ed90bc7abae3f8aae8343e45325f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93F5 10120 bytes

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