Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4d342dd7a24dd8…

MALICIOUS

PDF

44.5 KB Created: 2020-08-21 13:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cb80185c26b4c4dd2da43b1f0b3845e SHA-1: 1d8b75a1cec730872832e2af48681c7fe6f70e00 SHA-256: 0a4d342dd7a24dd809b8c2f0ccaeed5fd1edb30f116562e7d50e7c78c3c8ea85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to external, potentially harmful, web content.

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.com/pify?keyword=magisterium+series+book+3+pdf
    • http://gipuxuxi.socialdistancingwiththeriggs.com/uploads/1/3/2/6/132681352/e2f8dcc.pdf
    • http://files.musicin233.com/uploads/1/3/0/8/130874667/1775454.pdf
    • http://files.prideontheplains.com/uploads/1/3/1/4/131452982/8457773.pdf
    • http://files.foxtalesfiji.com/uploads/1/3/1/3/131383398/2162681.pdf
    • http://wosavabe.barefoottraveler.com/uploads/1/3/1/3/131384362/4062385.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7117/5846/files/61216180721.pdf
    • https://cdn.shopify.com/s/files/1/0438/4794/2294/files/15346024258.pdf
    • https://cdn.shopify.com/s/files/1/0430/8543/0945/files/64791586707.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/rijadu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/rosapegesezivula.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/12719442443.pdf
    • https://cdn.shopify.com/s/files/1/0438/4099/5490/files/87457231543.pdf
    • https://cdn.shopify.com/s/files/1/0447/1622/8761/files/24760921427.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_off00007093.bin
2e316993d87fc0c4f9f2fc3830ef535bc131fbd12b2c2d9764f09561e0c20a82
pdf-font-stream PDF embedded font (sfnt) at offset 0x7093 5700 bytes
font_01_sfnt_off000083ea.bin
971777b351622a42cb60ec593bff2527e97131dd2eab14a03eb30a6564ba6b95
pdf-font-stream PDF embedded font (sfnt) at offset 0x83EA 9816 bytes