Malicious PDF — malware analysis report

Static analysis result for SHA-256 36099e305fe6a667…

MALICIOUS

PDF

47.0 KB Created: 2020-08-30 05:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a55d5e7ea30ca6550ccf41af2cdbed7 SHA-1: ef1c33a6d2aaf022269de28fd72213bce9445139 SHA-256: 36099e305fe6a6675547331a94b133afbd4087c414774f0a9def089ed7fdceaa
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links points to 'ttraff.com', a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious content. The presence of a link farm further supports a malicious redirection scheme.

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=systems+analysis+and+design+in+a+cha
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/80797493674.pdf
    • https://cdn.shopify.com/s/files/1/0461/9206/6709/files/esl_pronunciation_worksheets_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0435/4975/3507/files/67358307616.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/34649437932.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/93160809326.pdf
    • https://cdn.shopify.com/s/files/1/0432/4789/4692/files/awkward_moments_children_s_bible.pdf
    • https://cdn.shopify.com/s/files/1/0435/6092/7393/files/spongiform_encephalopathy_define.pdf
    • https://cdn.shopify.com/s/files/1/0434/1989/3927/files/pantangi_at_pambalana_worksheet_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/7786/9476/files/.pdf
    • https://static.usrfiles.com/ugd/a1fb72_d6ce4a505a6841e9a8b8710ef7fb0b15.pdf
    • https://static.usrfiles.com/ugd/b8c837_503930efaa134338ab701eb24487daf0.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_off00007490.bin
7e0ee69fe3609c0a7858d884362369d91b3e4e8b829d41b5ee231a0ed714fa46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7490 5460 bytes
font_01_sfnt_off000086f1.bin
b81e00dca0d6fe3539b024e2a92d48bf9d49d1d60c89b0fd56983d063e774434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86F1 12124 bytes

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