Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be3f907fcf574db…

MALICIOUS

PDF

39.0 KB Created: 2020-08-29 03:39:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ced3bbc52217331f5e243e3d7d7bb0 SHA-1: 4b4a6fd0aa5ebc1108d0d899c604de97336f96d5 SHA-256: 9be3f907fcf574dbeadecd8617ba3dcc33b2eaa9ff37942c6f1dda76e988d7d3
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a link to known malicious redirector infrastructure, specifically disguised as a search result for 'Stihl fs 55 parts diagram pdf'. Additionally, the PDF hosts a link farm of numerous other PDFs, many hosted on Shopify, suggesting a SEO poisoning or link farm tactic to distribute 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.cc/wix?keyword=stihl+fs+55+parts+diagram+pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/dissolution_of_business_partnership_template.pdf
    • https://cdn.shopify.com/s/files/1/0435/6587/5359/files/museb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/legak.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/14487521896.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/redotevolipogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5687/4151/files/30419584003.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6361/files/womujuza.pdf
    • https://cdn.shopify.com/s/files/1/0437/8843/5613/files/60943621941.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/rikadawenenuligav.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6685/files/creating_a_vector_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0429/7110/3395/files/luwoluvo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/midnight_cowboy_script.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3985/files/90005506635.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/33396670459.pdf
    • https://cdn.shopify.com/s/files/1/0430/2651/4077/files/laliga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8777/files/69909863681.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_off00004d68.bin
302a385d36f4ae994e3135ea15b94d91999e821fb5204d94fa69c5a15a5db55f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D68 5136 bytes
font_01_sfnt_off00005ed4.bin
0fd35e5a923705f26e84aca3e69c9d09ed14b3dca9b6a7773faeabdd1dea7235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED4 10068 bytes
font_02_sfnt_off00008126.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8126 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.