Malicious PDF — malware analysis report

Static analysis result for SHA-256 84219d3a5a1b6834…

MALICIOUS

PDF

36.4 KB Created: 2020-08-20 01:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 396eafa6cbecfaa10af7141e9b4715f0 SHA-1: 904234e5d81afa8cc522d7029d3178c08102a82c SHA-256: 84219d3a5a1b68348f84810dd0df2ff9d2f1dfaaee466794811ba0d069569a44
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is https://ttraff.cc/pify?keyword=mathematics+for+economics+and+business+8th+pdf, which likely serves as a gateway to further malicious content. The document body, though malformed, contains text suggesting it is disguised as an academic PDF to encourage clicks.

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=mathematics+for+economics+and+business+8th+pdf
    • http://menej.lisabaudry.com/uploads/1/3/0/7/130776326/1873487.pdf
    • https://cdn.shopify.com/s/files/1/0431/9477/7760/files/nuzesaluvaruwanuxufej.pdf
    • https://cdn.shopify.com/s/files/1/0441/1283/8808/files/tevorefofapepa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0026/5878/files/how_to_get_fortune_enchantment.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/45968923303.pdf
    • https://cdn.shopify.com/s/files/1/0449/2630/4423/files/bhartiya_shiksha_ka_itihas.pdf
    • https://cdn.shopify.com/s/files/1/0429/3056/9382/files/18718456010.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1062/files/pujojosuxese.pdf
    • https://cdn.shopify.com/s/files/1/0436/4976/1433/files/e._coli_in_urinary_tract_infection.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4010/files/80847637208.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_off00004eaf.bin
2c6871c419b0c2af69673743241d6fea3dbbafc8c877cee67a20727ca3243345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EAF 5700 bytes
font_01_sfnt_off000061e5.bin
6ca08ffc7e12a2668c2659ad49427f5fd7a4da349a1cfe15e6491cd0c5ac280f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E5 10304 bytes

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