Malicious PDF — malware analysis report

Static analysis result for SHA-256 7100ea8a537488b1…

MALICIOUS

PDF

42.8 KB Created: 2020-08-20 23:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e97a44bd431f3791d8e6d4507741002 SHA-1: dec35962f90baf631beeac9cd068005a74454bec SHA-256: 7100ea8a537488b1ccd53181139c1eeba9e1f7efb9b9151276ad3d3b5a461eeb
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, some of which are benign Shopify links but others are unknown. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure, possibly 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/pify?keyword=electronically+stored+information+frcp
    • http://sitigiw.classicaltocontemporary.com/uploads/1/3/0/7/130740596/xeluv-kamofidot-fogutazibi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/28379980013.pdf
    • https://cdn.shopify.com/s/files/1/0432/3963/7155/files/10067161004.pdf
    • https://cdn.shopify.com/s/files/1/0460/5791/4523/files/biology_sample_paper_class_12_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/0895/8362/files/28511584040.pdf
    • https://cdn.shopify.com/s/files/1/0448/8983/3639/files/difference_between_one_way_and_two_way_anova.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/90307986929.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1048/files/68668353241.pdf
    • https://cdn.shopify.com/s/files/1/0431/4637/9426/files/66603699512.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/safevegiborilibazukeli.pdf
    • https://cdn.shopify.com/s/files/1/0434/3745/7574/files/abakada_book.pdf
    • https://cdn.shopify.com/s/files/1/0447/5607/4645/files/244_guidelines_engineering_lettering.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/tufobinenegesigusux.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5675/files/effect_of_alloying_elements_in_cast_iron.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_off000069a9.bin
e2d21d35e6e6b17da66deb07e8b5f38ddba619270383a871b612cf85de535f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A9 5360 bytes
font_01_sfnt_off00007bd1.bin
87c44864f9b62ce45b94ea7673239fa0ed3bd7aec1ef5ef20ba5eddb2339fbe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD1 10160 bytes

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