Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb0df9be435c3ffb…

MALICIOUS

PDF

65.9 KB Created: 2020-08-25 20:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddd61b5931c0287f254ba1dccec2346f SHA-1: f6564a9ec701ee8947fdc2c0bce09834505b8f50 SHA-256: bb0df9be435c3ffb78a344573da97d5baa35b4e48cce920b16c53cc8b0145ccb
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a redirector at 'ttraff.ru'. The document body, though partially corrupted, suggests a lure related to a 'manual de orden cerrado del ejercito peruano'. The ML classifier strongly flagged this PDF as malicious, and heuristic rules confirm the presence of malicious redirector links and a link farm.

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.ru/pify?keyword=manual+de+orden+cerrado+del+ejercito+peruano
    • http://rikusuxif.friendsofmarplestation.co.uk/uploads/1/3/1/4/131437987/dea013.pdf
    • http://files.rmhsasb.org/uploads/1/3/1/8/131857115/xexerugebegukude.pdf
    • http://lupositil.dailytherapy.net/uploads/1/3/1/6/131607505/4e3d01165402c.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3535/files/15379233349.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/waxojinoxokamerunur.pdf
    • https://cdn.shopify.com/s/files/1/0434/4807/4405/files/soduwuvaxisixewuzovivodiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/6526/9669/files/47917274935.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/9105549046.pdf
    • https://cdn.shopify.com/s/files/1/0434/8447/9641/files/beginner_bodybuilder_diet.pdf
    • https://cdn.shopify.com/s/files/1/0437/5111/2858/files/system_functional_requirements_document_template.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_off0000c461.bin
e0be499872d4976676e583653eabf98a7c4b51c8344c1b5c4af5d5654c05008a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC461 4968 bytes
font_01_sfnt_off0000d559.bin
f195ad916d91d8950aaced9e4cb6366cb75e1d61ae56db22c3f1c2fa12b522b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 11540 bytes

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