Malicious PDF — malware analysis report

Static analysis result for SHA-256 7839a82136828fcf…

MALICIOUS

PDF

64.6 KB Created: 2020-08-31 00:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3aae0c5ee381ff3ac4d9ba0238051af2 SHA-1: ea675e3c7f7551aa666ec2c3c8bd1aef766c3d54 SHA-256: 7839a82136828fcfcf73bf229cc9b55fc712c8ea10d65b07869039c12069885e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating a connection to known malicious infrastructure. The presence of a large number of external PDF links, identified by PDF_SEO_LINK_FARM, suggests a coordinated effort to manipulate search engine results or distribute content. The primary malicious URL identified is https://ttraff.cc/wix?keyword=abdul+alhazred+necronomicon.

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=abdul+alhazred+necronomicon
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_1e82f934b36f4cf597b373c1c665db9a.pdf
    • https://static.usrfiles.com/ugd/b444d4_a6e32d67ced74de99c38a868e6fbbd21.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ff3186acd834b2e8529789e18225bd5.pdf
    • https://static.usrfiles.com/ugd/3615fb_46ee931afab840fba91acc349f881de7.pdf
    • https://cdn.shopify.com/s/files/1/0433/7565/7121/files/gramatica_griega_moderna.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/bartier_cardi_feat_21_savage.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/10517763457.pdf
    • https://cdn.shopify.com/s/files/1/0431/4578/9600/files/40456880495.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/26973186330.pdf
    • https://static.usrfiles.com/ugd/6d59ab_bee292e9281045d8978d7c7f5141a514.pdf
    • https://static.usrfiles.com/ugd/804ff6_b75d763d0d89490fb83544f91665dba8.pdf
    • https://static.usrfiles.com/ugd/de02f3_8e338d31824849af9be7b96385c6d22f.pdf
    • https://static.usrfiles.com/ugd/6908d7_c388fae0cfde4e6986c13c0900113477.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a544.bin
6c6964ca179eb08130e8c8a6d6e3fe350bed75421e78bcb55311f18afad83880		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA544 5180 bytes
font_01_sfnt_off0000b6b1.bin
e9b2302fcc44f868b0a8900d830fa04d54ac29cf81bc533650b6e006e2d4e451		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B1 11208 bytes
font_02_sfnt_off0000dcbb.bin
499cf6b0c69fcf20e4a85219409d0c487c715158b251e7203541a92590a5dfe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 16912 bytes

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