Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ab5db9160d8fe6…

MALICIOUS

PDF

47.1 KB Created: 2020-08-08 11:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb11fc5e1e4bd501e34155abd304cfb6 SHA-1: ced08ee8698c47d517ff80e52b63ecf100f0a2c7 SHA-256: 83ab5db9160d8fe68e26ccb4e8afbaa4abf521aa44264bbd342f145d04e8c7da
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting seemingly benign PDF files. However, one critical link directs to a ttraff.com redirector, indicating a malicious intent to obscure the final destination. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the redirector and the link farm heuristic are sufficient indicators of a malicious link distribution scheme.

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=texture+and+structure+of+metamorphic+rocks+pdf
    • http://files.junctionworkshop.co.uk/uploads/1/3/0/7/130739987/9808266.pdf
    • http://files.aplusacademic.net/uploads/1/3/1/3/131379594/jizez.pdf
    • http://files.adamsmetaldetectorsonline.com/uploads/1/3/0/7/130776444/5771517.pdf
    • https://cdn.shopify.com/s/files/1/0450/8853/8776/files/arduino_uno_programming_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0431/5679/9647/files/alexander_mcqueen_biography.pdf
    • https://cdn.shopify.com/s/files/1/0434/7016/0032/files/53204085645.pdf
    • https://cdn.shopify.com/s/files/1/0434/0006/9285/files/4210461170.pdf
    • https://cdn.shopify.com/s/files/1/0439/0758/0072/files/renamixoxapuperezerugi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/pivifemabinasokofarejax.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/86752049224.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62386903812.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7318/files/24817081470.pdf
    • https://cdn.shopify.com/s/files/1/0430/6596/6754/files/vomoradatozewitusavupam.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/capital_cities_of_the_world_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8242/files/affixes_suffixes_and_prefixes.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_off00007c1c.bin
c33f7deae510df0dca51b449b1605baec150e5240d14f427ce464bc621f14b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1C 5444 bytes
font_01_sfnt_off00008e7a.bin
aa9a79ff76b8bd34ddab173115f5ecc194d34e4df32551014a3913e0ba2c4034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7A 9704 bytes

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