Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e73156195d4ad9…

MALICIOUS

PDF

41.7 KB Created: 2020-08-07 00:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfb4fa37fe6b80b6ed1f5446ff0c7728 SHA-1: ec3a0cc8b226018d18c771b46031201f79edf6d8 SHA-256: 54e73156195d4ad9b98af0322950cfac0bda60d84dc3b59871c0be58742c0a14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL and references 'plant physiology lincoln taiz book pdf', suggesting a lure. The PDF also exhibits a link farm behavior, with numerous external links, many hosted on Shopify, but some pointing to unknown domains. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link embedded within the document.

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=plant+physiology+lincoln+taiz+book+pdf
    • http://files.allthingsparanormaltx.com/uploads/1/3/1/6/131636956/mafozuvi.pdf
    • http://povige.palmdesertspacover.com/uploads/1/3/0/9/130969772/7400820.pdf
    • http://xiduzopo.silverfernflag.org/uploads/1/3/1/6/131607062/d44071.pdf
    • https://cdn.shopify.com/s/files/1/0431/5788/0996/files/dynamic_bones_unity.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0796/files/which_of_the_following_best_defines_scheduling.pdf
    • https://cdn.shopify.com/s/files/1/0431/0787/7017/files/autoregulation_of_cerebral_blood_flow.pdf
    • https://cdn.shopify.com/s/files/1/0438/4518/9794/files/smoking_and_spontaneous_abortion.pdf
    • https://cdn.shopify.com/s/files/1/0431/5611/1520/files/32054543283.pdf
    • https://cdn.shopify.com/s/files/1/0436/4215/9257/files/runigalovolupirurarokop.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6757/files/85046076693.pdf
    • https://cdn.shopify.com/s/files/1/0435/7485/3793/files/minecraft_fallout_maps.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/2782873949.pdf
    • https://cdn.shopify.com/s/files/1/0437/6707/0877/files/bohemian_rhapsody_violin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/9957/8773/files/verusafe.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/
    • https://cdn.shopify.com/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006060.bin
f9930a9df45f7898423e83b6fcaff171060f9cb6f9228cf7a702cb8a24716610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6060 5676 bytes
font_01_sfnt_off000073cb.bin
a97b6935adebd96e0ab99323503629d0bf3a4d007c8e29c691a378fc4512ecf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CB 12016 bytes

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