Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7705bbfd902c35…

MALICIOUS

PDF

54.1 KB Created: 2020-08-10 20:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb9df06353e154f665aea02d621b0c7f SHA-1: d6d4dde27916442ad3474f100e31aad4138a7c68 SHA-256: 0c7705bbfd902c3539f945f11d05b3f9fc05b5244126f6bcb2a58540e73fb346
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.com'. The document body, though partially corrupted, contains text related to sheet music and the 'wkhtmltopdf' tool, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=amazing+grace+jazz+piano+sheet+music+free+pdf
    • http://files.heightsfloraldesigns.com/uploads/1/3/0/8/130815009/vejimizij.pdf
    • http://files.lifton.ca/uploads/1/3/0/9/130969494/karow.pdf
    • http://files.dobwallsjuniorsfc.co.uk/uploads/1/3/1/3/131398143/vebuvobubaluxipoju.pdf
    • http://dojokoru.yogawithritamarie.com/uploads/1/3/0/7/130776483/28ca167.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/8924/5861/files/telecharger_bob_et_bobette.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/34509765604.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/30531319742.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/adding_text_to_linux.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/jozumokaxexagamilofoge.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/tivejodenegexafifene.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/pisojojepologapefejifad.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/nekam.pdf
    • https://cdn.shopify.com/s/files/1/0431/0669/7367/files/12090032959.pdf
    • https://cdn.shopify.com/s/files/1/0431/2642/3701/files/coastal_altimetry.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/62188303075.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/cours_de_francais_niveau_debutant.pdf
    • https://cdn.shopify.com/s/files/1/0430/1937/0659/files/73093343258.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ec3.bin
134e62c22afafc027733771292a802e60329f98c0bf6831ababda96544c33cc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EC3 5652 bytes
font_01_sfnt_off000091d1.bin
18f8287eba837bc83058fabbb30a1230ae9e7ab9011958dd4ee836e07df35f55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91D1 10456 bytes
font_02_sfnt_off0000b5cc.bin
d973db94ba2c448c661c26f08d051ac794e7cb4f3c7daa33c2141e8036f071b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CC 16100 bytes

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