Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1dc5d06d4b7347…

MALICIOUS

PDF

48.8 KB Created: 2020-07-26 15:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6fd2658f9d2a71f346108d41e1ca4e SHA-1: 13b90ed385caa53a71581c0ab4fc5550943d8a63 SHA-256: 9d1dc5d06d4b73474f17866682cccb0c1cee8c0d3d6f7ba3195a3d5dc6c2ab7f
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.cc, disguised as a search result for 'Best pathfinder character sheet app android'. The document body, though heavily obfuscated, appears to contain similar keywords. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute the malicious content. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=best+pathfinder+character+sheet+app+android
    • http://files.gowanuswines.com/uploads/1/3/1/4/131453615/losutezemonuf.pdf
    • http://files.standstrongcoalition.org/uploads/1/3/1/3/131379268/4608115.pdf
    • http://files.plateauenglish.org/uploads/1/3/0/7/130775441/6832540.pdf
    • http://files.spearwooduniting.org/uploads/1/3/0/7/130738732/765da.pdf
    • http://files.plateauenglish.org/uploads/1/3/0
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.pdf
    • https://cdn.shopify.com/s/files/1/0432/4212/7527/files/vasir.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/tivivofujidetilasuwikefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8886/2614/files/38122153130.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/71553782158.pdf
    • https://cdn.shopify.com/s/files/1/0428/9862/0569/files/34069248567.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2864/files/63669028821.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/pojuropanebapo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5061/files/vijetogunudepu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/fakulimofomovopetigiwisaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/8602/7677/files/73151935379.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_off00007878.bin
1640276aa517a08cd03b85fce2f9c4c2bb986e00386c8c0a3697029d7750ade8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7878 5048 bytes
font_01_sfnt_off00008985.bin
fa2dc2bc9bbdb96b86f480e8bbea6b8b13dce6b37e62a22236e6e32dffd6dbf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8985 1964 bytes
font_02_sfnt_off000092df.bin
1bc3462bf102a51577bc575db4b98320453e60e77781857b9dff3048d8586c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92DF 10056 bytes

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