Malicious PDF — malware analysis report

Static analysis result for SHA-256 539f53622e1e4db2…

MALICIOUS

PDF

39.1 KB Created: 2020-08-15 01:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8c2b0128563e07c6e1c4c3c6d977772 SHA-1: 0e2f71e122019592f83bb16a1e955d2bc7172104 SHA-256: 539f53622e1e4db2fda5ca0a884d5b183128be7ebee6356809e44e7069f04d4a
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/pify?keyword=birthday+wallpaper+background, which is likely used to obscure the final destination. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-optimized PDF links suggests a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=birthday+wallpaper+background
    • http://lumap.alpost522.com/uploads/1/3/1/6/131636612/d60efd43b.pdf
    • http://jowit.saundersfarmessentials.com/uploads/1/3/1/0/131070420/d124af5c9eec9.pdf
    • http://files.upscstudymaterials.com/uploads/1/3/1/3/131383619/1522095.pdf
    • http://files.saapmb.net/uploads/1/3/0/8/130814258/sugumej.pdf
    • http://gizoz.tkdonlineregistration.com/uploads/1/3/1/4/131407406/0ac46bc56.pdf
    • https://cdn.shopify.com/s/files/1/0430/0141/3785/files/anemia_ferropenica_oms_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/4243/8310/files/zodepuduba.pdf
    • https://cdn.shopify.com/s/files/1/0439/0515/5227/files/bed_sheet_texture_images.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/15855590530.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/accelerated_learning_techniques_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3208/files/tupagazutovunip.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/dewibiludejokag.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/81787524565.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/57016918118.pdf
    • https://cdn.shopify.com/s/files/1/0438/4115/9333/files/dnd_giant_elk.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/ibps_po_quantitative_aptitude_questions_with_answers.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_off00005b8d.bin
8e8c06a4746f7768032213828a429b355f5b24b6faef5fafd447999b0158a74e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B8D 5604 bytes
font_01_sfnt_off00006eab.bin
5d3410a8c3f0e4533c9f6c3ff64888666b239e80c346fde178c325a916941fbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAB 9660 bytes

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