Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7d2bf4fafd74e5…

MALICIOUS

PDF

36.5 KB Created: 2020-08-19 10:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcd7a775c20dbddb880d40d9f01d10bd SHA-1: c2279039851d59327b9a06f0c1f66142d47945c2 SHA-256: 7c7d2bf4fafd74e5435cb10e4f2dd74f03f57b6463911ddce013242b05ffa53e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/pify?keyword=kathi+movie+bgm+remix'. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

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/pify?keyword=kathi+movie+bgm+remix
    • http://files.craftedcasesnc.com/uploads/1/3/1/4/131453252/78ef3c11ab1da7.pdf
    • http://files.facepaintingparadise.com/uploads/1/3/1/6/131637240/f9a4a18f5c4a0d.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pazutorigixasozesilax.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/razijisaligebikureserefe.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/samadujosusibajibobetepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/37523006295.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/zilosudalo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5658/7174/files/kepiviwikotixu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/59839232627.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1448/files/80701425514.pdf
    • https://cdn.shopify.com/s/files/1/0447/4513/0133/files/23458692832.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/22226385106.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050fa.bin
b9590c7ae09ac2b2d59209d8cfc1a6ffbedf5280b16700628c37d13b0b8ad4f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x50FA 5128 bytes
font_01_sfnt_off0000625b.bin
736197acfe0a6687350eaca3d2ffcb0448fc62c7e185c1484463934530d37a63
pdf-font-stream PDF embedded font (sfnt) at offset 0x625B 10400 bytes