Malicious PDF — malware analysis report

Static analysis result for SHA-256 322f6e5b4c8d5247…

MALICIOUS

PDF

41.0 KB Created: 2020-08-23 08:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17bc6918b4f1af8f51f12a945c8ce474 SHA-1: e24cf3f2d166c5fa028f0865dec57dbd3ad1d9e6 SHA-256: 322f6e5b4c8d52472249e27b170f1a49d173e8ba8e2dbf37ec3b2de9034074e0
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a malicious redirector or other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict.

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.cc/pify?keyword=analytical+report+writing+pdf
    • http://files.carolteitelbaum.com/uploads/1/3/0/7/130739210/bepag.pdf
    • http://widojiz.ukahft.org/uploads/1/3/1/4/131408100/wunazun.pdf
    • http://xosebaku.westhollywoodappliancerepairpro.com/uploads/1/3/0/9/130969747/waxanizatigolozut.pdf
    • https://cdn.shopify.com/s/files/1/0430/6088/7705/files/50414185970.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5447/files/84994543407.pdf
    • https://cdn.shopify.com/s/files/1/0432/0909/7376/files/integral_calculus_area_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/6374/5441/files/94139110152.pdf
    • https://cdn.shopify.com/s/files/1/0433/4020/2142/files/puxezaborutiwafukipo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3028/9311/files/cakephp_form_control_default_value.pdf
    • https://cdn.shopify.com/s/files/1/0465/0562/3710/files/cable_tv_guide_austin_tx.pdf
    • https://cdn.shopify.com/s/files/1/0432/5248/2208/files/16356142710.pdf
    • https://cdn.shopify.com/s/files/1/0437/6775/8999/files/kuala_lumpur_food_guide.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_off000063ef.bin
d274c78c4fe3c3dcde766e521c2c2a97852470a107749fd66ef0b91f5ab5d0e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EF 5328 bytes
font_01_sfnt_off0000762f.bin
7bbe29086dc905dc0c7f67eadcc93d0498af584872fb293ea3fa00b8a370991c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762F 9728 bytes

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