Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfeb3284be563d0…

MALICIOUS

PDF

46.9 KB Created: 2020-08-08 04:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca18e3d70315b5fa9db288f5e11b174e SHA-1: c4ae410e9a223eebc753346898abb9430f2c3e18 SHA-256: 3dfeb3284be563d073ca62ca9da276ed6d0eda9105510dc300548ad70cbf3cb5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely used to funnel victims to a phishing or malware site. The document body, though partially garbled, suggests a lure related to financial documents. The heuristic PDF_SEO_LINK_FARM indicates a large number of outbound links, many pointing to benign Shopify URLs, but the presence of the malicious redirector link is the primary indicator of malicious intent. The ML classifier strongly supports the malicious verdict.

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=besoin+en+fond+de+roulement+normatif+exercice+corrig%25C3%25A9+pdf
    • http://files.wilkespe.com/uploads/1/3/1/0/131070379/2243810.pdf
    • http://daluwe.daimatours.com/uploads/1/3/2/7/132740214/futisemifive_juzebowiduwu_xevuxowete_sikeb.pdf
    • http://remot.alisonrooke.com/uploads/1/3/2/6/132681352/fubimemeso.pdf
    • http://files.office-alliance.com/uploads/1/3/1/6/131606874/3128754.pdf
    • http://files.norwoodcycleclub.org.uk/uploads/1/3/1/3/131384281/361887.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kiragin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/65623430351.pdf
    • https://cdn.shopify.com/s/files/1/0435/9107/3947/files/54486599038.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9869/files/dulada.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0427/8393/2582/files/42966676701.pdf
    • https://cdn.shopify.com/s/files/1/0430/7160/2855/files/xumuvig.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/61699057896.pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0810/files/input_type_file_preview.pdf
    • https://cdn.shopify.com/s/files/1/0431/6810/4610/files/81057262268.pdf
    • https://cdn.shopify.com/s/files/1/0451/1150/9145/files/bosch_pie631fb1e_instrukcja.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/pobajusemivodopademur.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_off000071a8.bin
e9688dccb621982840899821a64158f77bdaff590abf38333674c2e467c68102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A8 5736 bytes
font_01_sfnt_off000084de.bin
a7c2892d7f778f486403d0432f2b9ec526e4f915359e9f5b6507b4c82a7ef999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84DE 12312 bytes

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