Malicious PDF — malware analysis report

Static analysis result for SHA-256 be87b8b70229dcfd…

MALICIOUS

PDF

44.4 KB Created: 2020-08-09 23:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efee13c86e7bcdcc6f70e1770b4be138 SHA-1: 59bb35e971849f27a923a24158028054e822ca6c SHA-256: be87b8b70229dcfd5c01c6198ad573aaf1b121a77958ca524d446df1d19e4c85
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a link farm designed to appear as legitimate resources, specifically mentioning "irritable bowel syndrome books pdf". The primary link, https://ttraff.cc/pify?keyword=irritable+bowel+syndrome+books+pdf, is identified as a malicious redirector. This suggests a social engineering attack aiming to direct users to potentially harmful content or further malicious sites. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector and the link farm heuristic strongly indicate a phishing or content-luring attempt.

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=irritable+bowel+syndrome+books+pdf
    • http://files.ephesians320ministries.org/uploads/1/3/0/7/130776828/3128616.pdf
    • http://files.lebonearchitects.com/uploads/1/3/1/3/131379875/xezanezudijaw.pdf
    • http://wigavu.robertwburroughs.com/uploads/1/3/1/4/131407558/zimomo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/imgur_r_anal.pdf
    • https://cdn.shopify.com/s/files/1/0429/8850/3203/files/39139397252.pdf
    • https://cdn.shopify.com/s/files/1/0440/8901/6472/files/75047035920.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/galopanosunube.pdf
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/96581755706.pdf
    • https://cdn.shopify.com/s/files/1/0437/0091/2278/files/38764702747.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/dasam_granth_in_punjabi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4711/6197/files/pomaluregiwawogaxulerafe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2009/8472/files/lafopegowumodu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4786/9850/files/52815779263.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0325/files/libreoffice_import.pdf
    • https://cdn.shopify.com/s/files/1/0435/7059/3955/files/bejevipadexijisesugefutib.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/s/files/1/0433/4711/6197/files/pomaluregiwawogaxu

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ef3.bin
c3843f8c058e6058d559ed658a2df9758e7a40bc48d1ceb39f1a6dd16e6b4dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF3 5524 bytes
font_01_sfnt_off000081b5.bin
35cc0d658230b769930a7e45f6c5cdd326d2af3fcd9658170693ed6a91d5b5f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B5 10204 bytes

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