Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c61a346eb169a7…

MALICIOUS

PDF

62.1 KB Created: 2020-08-11 21:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e20fc79e3ed0972039428acd0b17fb9 SHA-1: 5b9d98d7db631d84e71750103f41874ed1c8ac38 SHA-256: 41c61a346eb169a7e36dd6980fe7ed736607075c0f314e869ac1378d92bf1617
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector service, which is a common technique for distributing malware or phishing pages. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags the URL 'https://ttraff.ru/pify?keyword=bukhari+muslim+urdu+pdf' as malicious. Additionally, the 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. The ML classifier also strongly indicated maliciousness.

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=bukhari+muslim+urdu+pdf
    • http://files.gunmanualsonline.com/uploads/1/3/1/4/131455463/bf8f4b39b68.pdf
    • http://files.troop11mp.org/uploads/1/3/2/6/132681617/3823113.pdf
    • http://files.chrisvanhillo.com/uploads/1/3/1/4/131409597/697d16c71c3998.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/54949963243.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/fakixoka.pdf
    • https://cdn.shopify.com/s/files/1/0431/1613/4562/files/functional_requirements_of_hospital_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/1222/6200/files/new_cutting_edge_elementary_teacher_s_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8685/5844/files/nusemakinenuvazu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2739/0887/files/9101304754.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/nodudokawewedegefexege.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0334/files/22950246418.pdf
    • https://cdn.shopify.com/s/files/1/0444/2531/4471/files/80093672274.pdf
    • https://cdn.shopify.com/s/files/1/0431/9608/8481/files/acordes_de_guitarra_sostenidos_y_bemoles.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0945/files/43319527107.pdf
    • https://cdn.shopify.com/s/files/1/0432/0722/9597/files/safari_magazine_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7700/files/bineriwomilejuliwilekana.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_off0000b638.bin
945663a83aaa8061a1b626afb43586839c835af30c18a7451a1b51b2bcac1a06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 5396 bytes
font_01_sfnt_off0000c86c.bin
427136fbe529863cb91b07bdd8ef8c8d355cbfb3fd1241c69a701526e54ff6ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 10256 bytes

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