Malicious PDF — malware analysis report

Static analysis result for SHA-256 9176ddbfeb6ca108…

MALICIOUS

PDF

47.8 KB Created: 2020-08-02 04:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f46e788343037ae40916327a6190aa0 SHA-1: 1157c30cd327aa8fc597dc8d83443eb57e1f8f0d SHA-256: 9176ddbfeb6ca1080ed153650e3d016c43255b79347317a2b9cbc7277daeace2
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on shopify.com and other domains, suggesting a link farm designed to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=dorics+quest+osrs
    • http://files.malcolmwhitepto.org/uploads/1/3/0/7/130775784/aa777a36f3.pdf
    • http://files.appleafterschool.com/uploads/1/3/1/6/131637308/5682650.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/26179602775.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wekisod.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/42861096517.pdf
    • https://cdn.shopify.com/s/files/1/0439/3825/0910/files/state_of_florida_earning_statement.pdf
    • http://files.mkumar.people.ua.edu/uploads/1/3/1/4/131437984/kaxogodevusume.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2657/files/dojavebenumoxeterowev.pdf
    • https://cdn.shopify.com/s/files/1/0434/0678/6725/files/dufirowibutefisivu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/80433077431.pdf
    • https://cdn.shopify.com/s/files/1/0433/3820/3290/files/13843411037.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/2794464060.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4284/files/43026835843.pdf
    • https://cdn.shopify.com/s/files/1/0441/3430/1848/files/87390567186.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/11334420764.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8349/files/15206360242.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_off0000781f.bin
f0bf6bb26ef1ecc387115d9aa8f02d6bd7266e3f6ab74a24ec9923ed32eb1cae
pdf-font-stream PDF embedded font (sfnt) at offset 0x781F 4676 bytes
font_01_sfnt_off00008823.bin
c1751499cf151412fc04f68b7c1ebc88bdbce434a2645072142e90a971327b5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8823 13104 bytes