Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a63e78c22bc04d…

MALICIOUS

PDF

66.4 KB Created: 2020-08-30 06:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b1a26bf34724f22ee25fbfa0fa1971b SHA-1: 1871503260c945e83ed139fcb21fa3a8dc1d2b4d SHA-256: 75a63e78c22bc04dc3c9e416524707428779b8c5da08bce01ed972336c855cc5
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains text related to a '2015 chevy sonic repair manual pdf', suggesting a lure to attract users. The presence of numerous external PDF links further indicates a link farm or SEO manipulation tactic. 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/wix?keyword=2015+chevy+sonic+repair+manual+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e73fea_dc7cdfa1c29b4f68a5bd926900e0cd25.pdf
    • https://static.usrfiles.com/ugd/8b9728_c10ce85fd95c4513b9777059344031fb.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_b0c8317f960b4feca36f4db43a9dc8c4.pdf
    • https://static.usrfiles.com/ugd/fd3290_7a736fe29f234392a3dd37c545453124.pdf
    • https://static.usrfiles.com/ugd/dd4472_4b743b01b67c4940a87dad4836c8f2f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb1e6880f2654da2884085ebdeb17af9.pdf
    • https://static.usrfiles.com/ugd/bf0735_059a5065f58240d68cececd20a33da55.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d7cf7449f994085882a662e3ea1e713.pdf
    • https://static.usrfiles.com/ugd/804ff6_63de45b6961b4d9680a7010a18550ee6.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/23515215170.pdf
    • https://cdn.shopify.com/s/files/1/0433/8463/5544/files/navugegujoro.pdf
    • https://cdn.shopify.com/s/files/1/0431/9939/8052/files/zefotobivago.pdf
    • https://cdn.shopify.com/s/files/1/0451/0878/9413/files/76748081682.pdf
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/25851039882.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_off0000af60.bin
3eb2c61f58ed041e712822aae1bbe5c4f741b067ed50c440e03221d45a362385
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF60 5912 bytes
font_01_sfnt_off0000c355.bin
41c951f7f9940237044d1643c8fe28e98e1f8b7244b9a05b4b67f0e967f6e020
pdf-font-stream PDF embedded font (sfnt) at offset 0xC355 19032 bytes