Malicious PDF — malware analysis report

Static analysis result for SHA-256 920a04f860c53a66…

MALICIOUS

PDF

49.8 KB Created: 2020-08-31 10:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c8be553b98f17b9e5440f3a6b6f855c SHA-1: 2374726970c5342392e33e52901357bc95cff025 SHA-256: 920a04f860c53a663f69329784890f00c5fb4f13666c01032ab675ccaedcd190
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a URL that appears to be a lure for game downloads. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, likely part of a link farm to improve search engine ranking for the malicious content. 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.ru/wix?keyword=nier+automata+3c3c1d119440927+dlc+download
    • https://cdn.shopify.com/s/files/1/0434/0652/4566/files/94191707639.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1002/files/42893294269.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/nifajovukike.pdf
    • https://cdn.shopify.com/s/files/1/0433/3705/6415/files/kuvukomu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9056/6556/files/rutepe.pdf
    • https://cdn.shopify.com/s/files/1/0449/9626/4094/files/the_one_minute_manager_kenneth_blanchard_spencer_johnson.pdf
    • https://cdn.shopify.com/s/files/1/0436/1604/3168/files/xujudeturukijutotomof.pdf
    • https://cdn.shopify.com/s/files/1/0428/5913/5132/files/70191223516.pdf
    • https://static.usrfiles.com/ugd/b8c837_7df349b8dad545d58ed9b50e11a55cc5.pdf
    • https://static.usrfiles.com/ugd/3d0627_039f68ba53024bdc960b33f39c64d14e.pdf
    • https://static.usrfiles.com/ugd/b8c837_11cf90d9264a4d69bbb1320605358a50.pdf
    • https://static.usrfiles.com/ugd/4d6844_bf4b507dab9e45b98b638407f7319835.pdf
    • https://static.usrfiles.com/ugd/33a16d_bce656dea7114837880ec478b8d30154.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1218/files/36398393824.pdf
    • https://cdn.shopify.com/s/files/1/0428/6296/8991/files/66245570338.pdf
    • https://cdn.shopify.com/s/files/1/0431/8648/7456/files/atomistique_chimie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dff.bin
8862747eaf1b00e4e2f23bfe14e59b625389a4861bb62fb1f6248892aeb56c0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFF 5784 bytes
font_01_sfnt_off000081b0.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B0 1800 bytes
font_02_sfnt_off00008a3e.bin
b3b3fcc2e19e1f1bf4ac5b7449ed393280600775ba9b9ab3f17878a0a7bcac4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3E 15508 bytes

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