Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91c4f7dc2b7e247…

MALICIOUS

PDF

44.0 KB Created: 2020-08-26 14:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 104beba5979fe47b22889aa4094dddb8 SHA-1: 977d9604372747601a3861befd6dc39ba5121509 SHA-256: f91c4f7dc2b7e247e9b96eba091aae91a14dd859a3b50fe693086fe82077ec2b
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it links to known malicious redirector infrastructure. It also contains a large number of external PDF links, suggesting a link farm. The embedded URL 'https://ttraff.link/pify?keyword=sterling+arms+22+pistol' is the primary indicator of malicious intent, likely serving as a lure or redirector. The presence of numerous Shopify URLs, while some are benign, contributes to the link farm characteristic.

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.link/pify?keyword=sterling+arms+22+pistol
    • http://rekov.camera1.ca/uploads/1/3/1/3/131380213/116e6962ec51889.pdf
    • http://gemasabox.ihsknightsboysbasketball.com/uploads/1/3/1/6/131606027/gumaveropisup.pdf
    • http://megenak.neverleaveonebehind.org/uploads/1/3/1/3/131379312/4571904.pdf
    • https://cdn.shopify.co
    • https://cdn.shopify.com/s/files/1/0435/2658/6520/files/how_to_open_discord_console.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/animated_backgrounds_for_websites_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/30981343831.pdf
    • https://cdn.shopify.com/s/files/1/0435/0817/0918/files/sample_appointment_letter_format_for_employee.pdf
    • https://cdn.shopify.com/s/files/1/0429/2437/6227/files/weather_forecast_moscow_idaho.pdf
    • https://cdn.shopify.com/s/files/1/0440/0224/6814/files/fusazisusunuxeli.pdf
    • https://cdn.shopify.com/s/files/1/0448/5575/4914/files/sample_business_plan_for_a_startup_company.pdf
    • https://cdn.shopify.com/s/files/1/0431/3396/0341/files/connaught_junior_school_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/25960433988.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/tornillo_sin_fin_y_corona.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9814/files/consumer_buying_behaviour_research_paper.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/arduino_uart_tutorial.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_off0000636b.bin
3eb4a3331d90ff9c6f99d57245111c4a8ded128041cb6c43be35a14f552dbcf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636B 5376 bytes
font_01_sfnt_off0000759b.bin
454dd2d728b2854d9602d919d24108004cf00ecc34db51b797dc954e3ec6b32a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x759B 14864 bytes

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