Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2ef0a6cde541fb…

MALICIOUS

PDF

36.9 KB Created: 2020-08-30 11:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7becf96edc42dfc081c3491b733d4233 SHA-1: 33114e08d5b6c41dafdc5912487062cd656519c1 SHA-256: 6f2ef0a6cde541fb07757a2e35e18d37a258ebf9373b5153372b8a89117ab667
174 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign but serve to obscure the malicious one. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector and the overall structure suggest an attempt to lead the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=94+cutlass+ciera+fuel+pump+relay
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_98cd7f61adbf4dd3a33e90340b305af8.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f6c7368f94247e494fa07c04dd2c076.pdf
    • https://static.usrfiles.com/ugd/73cb9e_b8d998976a1742e699ff7ca4c8966ff4.pdf
    • https://cdn.shopify.com/s/files/1/0429/0094/7103/files/forcibly_guided_contacts_mechanism.pdf
    • https://cdn.shopify.com/s/files/1/0446/6386/5497/files/pajuzevituxufewesedawar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73930450062.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/wekiwixujixo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/zadoxop.pdf
    • https://cdn.shopify.com/s/files/1/0435/5293/1995/files/50691007295.pdf
    • https://cdn.shopify.com/s/files/1/0438/2903/5158/files/for_loop_in_ruby.pdf
    • https://cdn.shopify.com/s/files/1/0430/7854/9665/files/dufiganinog.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/sizobonajababaf.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_off00005151.bin
080db35bc1d38bb2aa2323241c1748f8ec1cf38f8f6204a89cdff989e82f6581		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5151 5412 bytes
font_01_sfnt_off000063ac.bin
51ce0263a8c43815289adb58f9c0fd4cb959c04ffdb0100a259cd24f0d4fb3d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63AC 10420 bytes

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