Malicious PDF — malware analysis report

Static analysis result for SHA-256 a095d3958d528313…

MALICIOUS

PDF

40.6 KB Created: 2020-08-29 12:38:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 177671938b34cd61e79ceb6189b0ab6e SHA-1: e041f14d6b690ca83cc0d91bb9151fedd3d1ae76 SHA-256: a095d3958d5283131355896f783eb1079325b5eee4726eca04136ed64f97d527
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one critical link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to downloading pornographic videos and the malicious URL. This indicates a social engineering lure to drive traffic to malicious 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/wix?keyword=download+porn+videos
    • https://static.usrfiles.com/ugd/b8c837_a46e307927524d7b918de77948ad4da4.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb1c2cc5fe0c464d98a326934d4d392c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1587aea5e0934618be9b5e73dd47a9df.pdf
    • https://cdn.shopify.com/s/files/1/0427/3229/0215/files/dukelulenetaserogopog.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/44672608727.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7570/files/puzoletur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6471/files/champagne_dress_formal.pdf
    • https://static.usrfiles.com/ugd/b8c837_9010707b508d4fe29e5c843adfd177c3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3776a5ddc8e743ee883cc026ff267536.pdf
    • https://static.usrfiles.com/ugd/b8c837_d651e23ab92a46b288ddd990eec6e769.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd90fd5aa21c403b9fa69f9de514cb60.pdf
    • https://static.usrfiles.com/ugd/b8c837_042007822ad24e519d279f0d3604b673.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8842bec2de24456a8403725306eee8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed9760caa78041888ba70a56e72639cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d0f953515b345c1a971217f11b84568.pdf
    • https://www.youtube.com
    • 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_off00004cac.bin
78ebdf7e1920e075a8afab31c26d0221e05f9b28044b37351b8d83e8f79bf857
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CAC 5104 bytes
font_01_sfnt_off00005e31.bin
88b66160975385c4b36914f2d66b4f560ff534c0bf3d6651d336a32c45137ae6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E31 9660 bytes
font_02_sfnt_off00007f7c.bin
356682dec5e87afc81ba79cf04cf18148081083da9129e7b35e08d592d757603
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7C 16448 bytes