Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d70651af22cd6a…

MALICIOUS

PDF

45.3 KB Created: 2020-08-27 21:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebbd3213ca33b9f587b36f4ec7369379 SHA-1: 14f691bc447180e5dbdfcde8aec0d6ab63b30c14 SHA-256: 34d70651af22cd6aa6a870dd1ba9dd06e3cd793380afa0e665debac646e594b3
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered the redirector heuristic. The presence of numerous embedded links, many pointing to the same redirector, suggests a link farm or redirection scheme designed to obscure the ultimate malicious destination.

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=kung+fu+nes+manual
    • http://files.robnunny.net/uploads/1/3/2/3/132302888/2429884.pdf
    • http://files.livingrawbygrace.com/uploads/1/3/1/6/131636678/nanabumufanuba.pdf
    • http://rosawajud.dcstrong.org/uploads/1/3/1/1/131164250/vesenage.pdf
    • http://files.realestateinvestmenttrust.hu/uploads/1/3/0/7/130739744/mazudiki-sanujelaxafet.pdf
    • https://cdn.shopify.com/s/files/1/0431/4031/7350/files/tigex.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/the_mobile_application_hackers_hand.pdf
    • https://cdn.shopify.com/s/files/1/0466/4999/9525/files/master_tigress_porn.pdf
    • https://cdn.shopify.com/s/files/1/0438/8601/8712/files/pc_baseball_games.pdf
    • https://cdn.shopify.com/s/files/1/0434/8372/5990/files/honda_rebel_450.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/85226496709.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7271/files/17949859016.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/jikuda.pdf
    • https://cdn.shopify.com/s/files/1/0431/3363/2661/files/pominuwuzed.pdf
    • https://cdn.shopify.com/s/files/1/0456/9946/5372/files/good_morning_photo_full.pdf
    • https://cdn.shopify.com/s/files/1/0433/5206/4155/files/law_of_acceleration_problems.pdf
    • https://cdn.shopify.com/s/files/1/0428/8518/5702/files/nikola_tesla_biography.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/62508073510.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_off00006ad5.bin
c5a8587afb2d458d96c5fbb669438f1e8dada821da66c11524b14e2d551510e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD5 4960 bytes
font_01_sfnt_off00007bb7.bin
0a2c6c43cb1d10b88f2ee625613752c39d8a52ca528b785a377fdca23bd5f2de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB7 14268 bytes

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