Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ce1dba7c1449da…

MALICIOUS

PDF

38.7 KB Created: 2020-08-12 06:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51fddb632a9f00cd1941a2f0f8acd40e SHA-1: 92104a5aae4e8da9e48800cb9c5f12a4a0fe5229 SHA-256: 81ce1dba7c1449dafd27aa2c84a44833934b975c56dee4056eecf7b591e733e0
120 Risk Score

Malware Insights

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

The PDF file contains numerous links, masquerading as a free textbook download. The primary link, 'https://ttraff.cc/wb?keyword=ccna%20textbook%20free%20download%20pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links pointing to external PDFs, many hosted on Shopify. This suggests a phishing or scam attempt to redirect users to potentially harmful content.

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/wb?keyword=ccna%20textbook%20free%20download%20pdf
    • http://files.ebrightfoundation.org/uploads/1/3/1/3/131398366/3417868.pdf
    • http://files.londonslings.com/uploads/1/3/0/8/130873902/vagunonikejoxa.pdf
    • http://rowizilad.buildabow.ca/uploads/1/3/1/6/131607062/xejes_xafikeloxojegil_linote.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/vomozafexivumidixaxaxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0429/5619/3955/files/60832510512.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/95979370616.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7802/files/16586610063.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1475/files/form_130_u.pdf
    • https://cdn.shopify.com/s/files/1/0434/2893/7880/files/how_to_send_videos_on_discord.pdf
    • https://cdn.shopify.com/s/files/1/0440/8547/7541/files/libasazufokadu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9632/4758/files/99012759519.pdf
    • https://cdn.shopify.com/s/files/1/0431/6305/8340/files/addictive_thinking_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/tomojarofokuta.pdf
    • https://cdn.shopify.com/s/files/1/0427/8052/4710/files/giwetapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6112/files/marathi_barakhadi_free_download.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_off00004f23.bin
73d6230b12d8a364f18db7fb392c6665ad2f3e3a64d4fbfffbfc8038bd75450a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F23 5240 bytes
font_01_sfnt_off0000610f.bin
895ec0178e42085fad14190ae16fd63aaffc56d0f65995d3c3a6e2e609231d53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610F 19272 bytes

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