Malicious PDF — malware analysis report

Static analysis result for SHA-256 814031b64cf3bde4…

MALICIOUS

PDF

39.9 KB Created: 2020-08-18 16:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a906f40e3f1a1a288125910c9cde8c1b SHA-1: a00f004b050f10d688529309bb1c05f9be194912 SHA-256: 814031b64cf3bde4411c978452ebe827f3034970aafb8897feeff6d30f627fa5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily corrupted, contains the text "Cute calendar template" and the malicious URL, suggesting a social engineering lure. The presence of numerous PDF links, many hosted on Shopify, indicates an attempt to create a link farm for SEO poisoning or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=cute+calendar+template
    • http://files.drjerryjacobson.com/uploads/1/3/1/4/131411857/vopewokogu.pdf
    • http://files.classroomconversations.org/uploads/1/3/1/4/131406258/a56b6157455c.pdf
    • http://files.bigprint.org.uk/uploads/1/3/1/3/131383323/6c7a8d5ae57d17.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91489653134.pdf
    • https://cdn.shopify.com/s/files/1/0438/0586/8193/files/shake_ya_tailfeather.pdf
    • https://cdn.shopify.com/s/files/1/0434/7530/4612/files/33909657774.pdf
    • https://cdn.shopify.com/s/files/1/0447/1137/9097/files/l_alchimista_paulo_coelho_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1779/6770/files/58427900257.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevaziretojigadogikoranab.pdf
    • https://cdn.shopify.com/s/files/1/0437/5547/1006/files/adjectives_words_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/7906/6009/files/86021658640.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/nvm_install_node.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_off0000604d.bin
6ea613da534f2beda31b8f04f68d85135b5cea96aced2ce9afb0502dbf6f3835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604D 4948 bytes
font_01_sfnt_off00007103.bin
ef45b97f3434fb2dee1df5fdb06853475f637963a223f6c2b5274de6eb563614		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7103 10060 bytes

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