Malicious PDF — malware analysis report

Static analysis result for SHA-256 21cb957c21e56c2c…

MALICIOUS

PDF

44.1 KB Created: 2020-08-12 09:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f4a4446532cc63f1c72546ae4a409e1 SHA-1: b0bdf8016e20de568ae3aafcc254c0b1e113980f SHA-256: 21cb957c21e56c2cd74a0426f9032d3e522e3d61f4709f23938fd39118b81db6
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains the malicious URL and references to a 'marketing essentials textbook pdf', suggesting a lure. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further 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=marketing+essentials+textbook+pdf
    • http://mizul.melissavanepps.com/uploads/1/3/0/8/130813612/romulufubegexotaxufu.pdf
    • http://files.jandegooijer.nl/uploads/1/3/0/8/130814192/1fb4fd04e.pdf
    • http://sezigot.wteainfo.org/uploads/1/3/1/4/131407406/vakuzinixujubi-wijulem.pdf
    • https://cdn.shopify.com/s/files/1/0439/5529/0270/files/48634874307.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/38702968372.pdf
    • https://cdn.shopify.com/s/files/1/0430/4837/0333/files/76338223728.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/86186963157.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2246/files/12483196806.pdf
    • https://cdn.shopify.com/s/files/1/0437/0831/7850/files/manual_blender_2._79_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0438/1445/3410/files/kebiromis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5464/4894/files/96986875607.pdf
    • https://cdn.shopify.com/s/files/1/0438/7107/6520/files/61184825201.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9489/files/kuzukiwugewabinofe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7164/3554/files/96751746161.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/administrao_da_produo_slack_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/1936751968.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_off00006d6d.bin
b80aa97bc831495dae5f5e0e981ab9556c81763f696d1f370e8bda1fb3bb380e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6D 5484 bytes
font_01_sfnt_off00008028.bin
a104d81624f6309ef9bf29d873afda738b92f118356fbff3718016b6cff5d092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8028 10340 bytes

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