Malicious PDF — malware analysis report

Static analysis result for SHA-256 817662ca9010b45c…

MALICIOUS

PDF

52.0 KB Created: 2020-08-31 00:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c3d2c9caacc737a3af69a560aa16cba SHA-1: 36fb0b4ce7b192e3327bc510a198c8ff0558185e SHA-256: 817662ca9010b45c76af20118c8b9c8e5dd97bfe25f93da6e8dca88844df60b1
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains numerous embedded links. One prominent URL, https://ttraff.ru/wix?keyword=fractured+but+whole+best+class+combos, is identified as a malicious redirector. The document also exhibits characteristics of a PDF link farm, with many links pointing to static.usrfiles.com, suggesting an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly benign links.

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/wix?keyword=fractured+but+whole+best+class+combos
    • https://static.usrfiles.com/ugd/b8c837_2e3a30113151436e925358d05a45388e.pdf
    • https://static.usrfiles.com/ugd/5ad03d_edb95da175924459939decdfebd75ee0.pdf
    • https://static.usrfiles.com/ugd/277b62_741c420e732d4d42b5505e2c24bc2620.pdf
    • https://static.usrfiles.com/ugd/61f964_9f6bf9a67fd34855bb4bf07b64514bc8.pdf
    • https://static.usrfiles.com/ugd/2c8d66_dd1e02bee070475cb365653061452962.pdf
    • https://static.usrfiles.com/ugd/04e6f9_2f5f69d9039448e1a208960588dd5841.pdf
    • https://static.usrfiles.com/ugd/affaa6_8a6a0c859c35489394f76d44b510e7ab.pdf
    • https://cdn.shopify.com/s/files/1/0436/7394/4217/files/advertising_media_planning_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7911/files/goxujuzepibutuwasepop.pdf
    • https://cdn.shopify.com/s/files/1/0461/6408/2851/files/30417555417.pdf
    • https://cdn.shopify.com/s/files/1/0438/3778/4224/files/gm_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23063093424.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_off00008f31.bin
d37a4cfef5b406f4c238496717a8edfc5864cf8ad2d923b582a57c6e35ce6a05
pdf-font-stream PDF embedded font (sfnt) at offset 0x8F31 5368 bytes
font_01_sfnt_off0000a156.bin
72a8041eaf681b26c524550c2d68b8f9a2bf2ae979022de0d9c0c08d0c8f74fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xA156 9896 bytes