Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb47c56e13ddb08f…

MALICIOUS

PDF

36.1 KB Created: 2020-08-06 08:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8991f1b31b6ce2b57bb5d214a82a759 SHA-1: 49402c1dfd9f672ff1999004cdc2c19100e4f6c7 SHA-256: fb47c56e13ddb08f3463fa8509790e4f7ae4d5567f9fda3f749f764c98252cf6
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a test for adverbs and adjectives. This link leads to a link farm hosted on Shopify, which in turn points to numerous other PDF files. The ML classifier strongly indicated maliciousness, and the PDF structure itself is designed to host and distribute multiple external links.

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=adverbs+and+adjectives+test+pdf
    • http://files.lumisworks.com/uploads/1/3/0/7/130775265/ropokoresibefijo.pdf
    • http://files.bestfenceonline.com/uploads/1/3/1/3/131380063/9561019.pdf
    • http://files.michellerodesinteriors.com/uploads/1/3/0/7/130739053/fe634ca25d5.pdf
    • http://files.yourhomey.com/uploads/1/3/1/0/131070362/3ff747d990799ad.pdf
    • http://files.youcandoitdancefitness.com/uploads/1/3/1/4/131438510/4253233.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2843/files/junozafuli.pdf
    • https://cdn.shopify.com/s/files/1/0445/8453/4180/files/atoms_and_molecules_class_9_questions.pdf
    • https://cdn.shopify.com/s/files/1/0434/7569/7830/files/2020_calendar_july.pdf
    • https://cdn.shopify.com/s/files/1/0430/4433/9861/files/waxenamovulinugezururuka.pdf
    • https://cdn.shopify.com/s/files/1/0433/9187/7283/files/2060279369.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/bebuxiwexodopo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4103/files/70475832722.pdf
    • https://cdn.shopify.com/s/files/1/0431/4434/7799/files/43064568802.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/9881780517.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/musimore.pdf
    • https://cdn.shopify.com/s/files/1/0430/4162/0119/files/divinity_original_sin_2_nude_mod.pdf
    • https://cdn.shopify.com/s/files/1/0431/0102/8503/files/27767307622.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_off000048be.bin
71797ab1b60db650656ba5121328b6757c65692840ede00e8ee12ec8e34bf9a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48BE 5384 bytes
font_01_sfnt_off00005b24.bin
dfbc88c1558f17e893061cf3c9c0f607d90be6c7a1bc8f7f6d303e6d5c0db8aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B24 12744 bytes

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