Malicious PDF — malware analysis report

Static analysis result for SHA-256 1715b761b5bb6360…

MALICIOUS

PDF

35.7 KB Created: 2020-08-18 15:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31dfd8bd7e1fd7f5ab444119f347681a SHA-1: ec84a2d83d2a79b8d225fb34036d105232adda46 SHA-256: 1715b761b5bb63601c30c284dfd9fd16d35f3e429b9415e14d6f14969b02678b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including a critical redirector link to 'ttraff.com', disguised as a free song download. This indicates a likely phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. The presence of many external links suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites.

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/pify?keyword=alphabet+sounds+song+free
    • http://vebivej.smallhaus.net/uploads/1/3/0/8/130814328/5181888.pdf
    • http://files.princetondogtrainingclub.com/uploads/1/3/1/4/131438308/mituwo-vesuz.pdf
    • http://files.cooperrothe2016.com/uploads/1/3/1/4/131438195/3047147.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6989/8913/files/904397856.pdf
    • https://cdn.shopify.com/s/files/1/0431/2629/2634/files/applications_of_computer_in_microbiology.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2057/files/99085494665.pdf
    • https://cdn.shopify.com/s/files/1/0434/2821/6983/files/60772537754.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/11952969009.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdf
    • https://cdn.shopify.com/s/files/1/0433/7093/8533/files/ways_of_the_world_3rd_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7880/2846/files/67146414027.pdf
    • https://cdn.shopify.com/s/files/1/0434/4178/2946/files/83966627825.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8285/files/27696448914.pdf
    • https://cdn.shopify.com/s/files/1/0433/9430/2117/files/97603404805.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5469/files/lafisaparelujisusikelupin.pdf
    • https://cdn.shopify.com/s/files/1/0429/5763/5743/files/xunenub.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5079/files/7908390900.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_off00004d6e.bin
0cd6b39fcd31257e4d4f9269438c49f8fec6fe9f9f67162034253098eeba6ed9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D6E 5432 bytes
font_01_sfnt_off00005fd7.bin
80146ca6d8b55140340f26648895324e5ff5999798b1e6be9664aa8e50ee83c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD7 10016 bytes

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