Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0f8081835822ed…

MALICIOUS

PDF

49.6 KB Created: 2020-08-06 20:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35ae4d7b2b720be0519556dbf1f59c8e SHA-1: 7afdfa9eb35a7e1234f6754354dd44110f7dd53f SHA-256: 5a0f8081835822ed6da16eb5f4bfc6c5d975079ec8c3b7808a41daab97677a61
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text related to 'edexcel a level maths textbooks pdf' and the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. The ML classifier strongly indicated maliciousness.

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.com/pify?keyword=edexcel+a+level+maths+textbooks+pdf
    • http://files.brigetteburns.com/uploads/1/3/1/3/131380292/norimitufilovigu.pdf
    • http://files.teamfloridahoops.com/uploads/1/3/2/6/132681426/sodipegogodubitiwaje.pdf
    • http://files.dunphyshandguntraining.com/uploads/1/3/2/6/132681566/d354c601d.pdf
    • http://files.hamiltonhillhounds.com/uploads/1/3/0/7/130740112/zisexipova.pdf
    • http://files.fairfaxgammaphibeta.org/uploads/1/3/0/7/130739713/vazuganete.pdf
    • https://cdn.shopify.com/s/files/1/0448/5742/6081/files/set_up_teams_gen_1_ou.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/nuriluzipuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapiguwidekedod.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3744/files/walk_behind_forklift.pdf
    • https://cdn.shopify.com/s/files/1/0432/2879/0946/files/27403486431.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89709194360.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37394074323.pdf
    • https://cdn.shopify.com/s/files/1/0434/4119/3110/files/botaxuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.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_off00006c45.bin
898ef062c65280945b784edcf4623b463dbdda4f310af9ffb273a1bc861d3e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C45 5588 bytes
font_01_sfnt_off00007f2d.bin
c31eae458061c20e9673aa0729836ab90f8e95fa10b2b533f827e6f4fe0e5deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2D 9848 bytes
font_02_sfnt_off0000a111.bin
cb0f0480cbad88693a39a5b2c8f76a73b445daf7922d682334e812dca86920cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA111 16976 bytes

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