Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86c4108b6e3c610…

MALICIOUS

PDF

38.1 KB Created: 2020-08-31 01:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc69c9685f5265dcb0c4f18041330df7 SHA-1: c673d8a940b12f9cbcdcfa0cb30a93a2f6107ef3 SHA-256: b86c4108b6e3c610074ed1394fdbd408b0cd6f58df5495ddd8da0a18d60a5c12
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are benign but likely serve to obscure the malicious one. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure, but the primary malicious indicator is the redirector URL.

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.com/wix?keyword=passive+voice+practice+ppt
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/veludatoxaraguzawegevaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2086/files/estadistica_parametrica_y_no_parametrica_ejemplos.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3171/files/62227014621.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6835/files/airport_city_android_1.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9399/files/wella_color_touch_chart.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/puntos_de_partida_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/6706/1925/files/kekewitijeno.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/41223719295.pdf
    • https://static.usrfiles.com/ugd/67e251_d6b70a4fc6ff47b69b18c06f9ba11ccf.pdf
    • https://static.usrfiles.com/ugd/8ab72e_7c072dce5b0e403eb28ff062f5a211b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c30b724d95e481bb88dec8bf69ee96b.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_off00004cf9.bin
94bcaa3818800715f06346e8651a802259d56314208f63207e0bfed4fc10ee32
pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF9 4636 bytes
font_01_sfnt_off00005cd0.bin
7285aea15945981444ee17bddb7844a78b3038b2b39f18cc9b650989d369cd11
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD0 9544 bytes
font_02_sfnt_off00007d85.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D85 4324 bytes