Malicious PDF — malware analysis report

Static analysis result for SHA-256 5742169a871ffd60…

MALICIOUS

PDF

39.9 KB Created: 2020-08-20 00:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcc8d60e3630012196f2a9b3f2bf2e5d SHA-1: 83bf266a421b63441cf6b380c3b203113053993b SHA-256: 5742169a871ffd60a186fdbb9dda61dd1111000e568c8ffc820e4c2fbfdcba6e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic firings indicate a link farm designed to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated and contains the primary malicious URL, suggesting it's a lure to redirect users to harmful sites.

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.ru/pify?keyword=terraforming+mars+bgg+promo
    • http://files.oneilbldrs.com/uploads/1/3/2/6/132681976/6289754.pdf
    • https://cdn.shopify.com/s/files/1/0438/4446/8898/files/melhor_antivrus_para_android_gratuito_2019.pdf
    • https://cdn.shopify.com/s/files/1/0443/1101/9676/files/43515907846.pdf
    • https://cdn.shopify.com/s/files/1/0434/6275/4461/files/fugukof.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/4972269283.pdf
    • https://cdn.shopify.com/s/files/1/0433/4485/5194/files/67801242173.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bamizubonofosexewa.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/photoshop_3d_text_effects.pdf
    • https://cdn.shopify.com/s/files/1/0430/0914/7043/files/49621955385.pdf
    • https://cdn.shopify.com/s/files/1/0448/1299/2674/files/paulk_workbench_plans.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_off00005218.bin
04d3b354349dc61007ba1a8aad2f8826480a10678390e6c0dba9918860458ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5218 5280 bytes
font_01_sfnt_off000063f9.bin
9f1cb2288eda5310e1dec4d38e83e2787abf184052cfb8d0cbe25caf902de561		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F9 15220 bytes

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