Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76ba941bbf94dd6…

MALICIOUS

PDF

41.4 KB Created: 2020-08-06 11:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bb342ef315fde3154101708e2e951d7 SHA-1: eb6f7e7932a38d144720100c0610b65064c6055c SHA-256: f76ba941bbf94dd6a80bdd601bb4f8e04938b375df1295980f3017c77a6f6c44
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL identified. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to PDF downloads, suggesting a lure to external malicious content. The presence of multiple Shopify URLs, some confirmed benign, alongside the malicious ttraff.com URL, indicates a tactic to blend malicious links with seemingly legitimate ones.

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.com/pify?keyword=atlas+of+anatomy+gilroy+pdf
    • http://files.churchillorchestra.org/uploads/1/3/0/9/130969525/bubaj.pdf
    • http://files.icarusrx.com/uploads/1/3/1/6/131637114/wowoxosejewuk.pdf
    • http://files.heatherioneharding.com/uploads/1/3/2/8/132814990/2341072.pdf
    • https://cdn.shopify.com/s/files/1/0433/7677/1224/files/doninefujowepobevof.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/77343039668.pdf
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/anti_inflammatory_diet_pyramid.pdf
    • https://cdn.shopify.com/s/files/1/0433/1657/6424/files/vikesano.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/famimodiveluvolat.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2056/files/85204721600.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/abrsm_piano_scales.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/c_linked_list_class_implementation.pdf
    • https://cdn.shopify.com/s/files/1/0432/0952/3355/files/71603826499.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_off00006326.bin
d1ce01de1452a0bf1342567222ab931bb91a344e060a3eed22e9c48028520da6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6326 5452 bytes
font_01_sfnt_off000075a6.bin
4320ad0f9919498b9ce0a4eca8641a55662d2e04f1f070acb8ed4dc6aef93fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A6 10476 bytes