Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba06af9ada6c76c…

MALICIOUS

PDF

41.3 KB Created: 2020-08-18 16:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f336c569b220f5dfcc04249f73c84c8 SHA-1: 79c6c8d510bce1e933da122ee7f4f6bed2100f42 SHA-256: 5ba06af9ada6c76cc3c0454abd7cb964329b1ed819c1e58a177fbdcab4245c4b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one identified as a malicious redirector (ttraff.cc). The ML classifier strongly indicated maliciousness. The document appears to be part of a link farm or SEO manipulation tactic, likely intended to drive traffic through the redirector or to other PDF files.

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=3d+printing+guidelines+pdf
    • http://files.smosparish.com/uploads/1/3/1/3/131383325/5c332299.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7446/0579/files/gefisaxewopexedino.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/nonelox.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/82986596180.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39646295774.pdf
    • https://cdn.shopify.com/s/files/1/0434/9883/2037/files/95493787026.pdf
    • https://cdn.shopify.com/s/files/1/0435/3887/4532/files/moonwalking_with_einstein_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/23936574639.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7822/files/worerapujudog.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/cassava_farming_and_processing_business_plan_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0429/8339/1395/files/5562648964.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_off0000637f.bin
2143108741581688511340106cdc479abaa8c3c9539b88d5e44b0c35effea421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637F 5068 bytes
font_01_sfnt_off000074ce.bin
90493f25d5fcd8acb0bb7c923f7d1452d4b8c3de501bcbd3a204871f71e51405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CE 10400 bytes

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