Malicious PDF — malware analysis report

Static analysis result for SHA-256 669a81894387326a…

MALICIOUS

PDF

40.5 KB Created: 2020-04-01 12:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6e45d1505f4fcbf0d624f969df90e66b SHA-1: 26eebabe56b17ce88d4c0f07f4d6d028856c48fe SHA-256: 669a81894387326a28213495875713b901ce40e23d51d56de8fe7b9d68aa4198
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the embedded links suggest an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://nightfurytruckingllc.net/uploads/1/3/0/5/130588976/130588976.html#competencias+de+lenguaje+para+cuarto+grado
    • http://paikeasailing.com/uploads/1/3/0/6/130621873/zudalefidopep-zapoxinona-guwamuz-xulelexa.pdf
    • http://slaphappymedia.com/uploads/1/3/1/3/131378806/vokemopasobu.pdf
    • http://sweetcakeshomemade.com/uploads/1/3/0/7/130740432/toxorowita.pdf
    • http://easybiowri.net/uploads/1/3/0/5/130545098/jipafawiliwegi-gixolepazukipo-busirafude.pdf
    • http://superselections.net/uploads/1/3/0/4/130483507/b1e3e749a91.pdf
    • http://southernbelleshimmer.com/uploads/1/3/0/8/130874366/nabekigib-lodidurara-nunaveluninuru.pdf
    • http://rltclothing.com/uploads/1/3/0/9/130969459/3976460.pdf
    • http://puertovallartadestinationweddings.com/uploads/1/3/1/1/131164448/ae3c7491.pdf
    • http://lonniefree.net/uploads/1/3/1/3/131380688/8156be561d9.pdf
    • http://biofouling.net/uploads/1/3/0/7/130775951/zimusugusuvim_burulogaruz.pdf
    • http://baytownlandclearing.com/uploads/1/3/0/4/130476101/kupexinimurowopemuf.pdf
    • http://jeep-wrangler-rubicon.com/uploads/1/3/0/4/130476573/1004837.pdf
    • http://eilishfoleyva.com/uploads/1/3/0/7/130775983/sizesujijofolubofora.pdf
    • http://anastasiasjewelry.com/uploads/1/3/0/7/130739982/kujavapav.pdf
    • http://osullivanfitness.com/uploads/1/3/0/4/130483842/359532.pdf
    • http://college-elf.com/uploads/1/3/1/4/131438464/e5d2248.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007992.bin
4e98508c80cb2651a84cc40c12a139026176c5a3930d75b4d273ec15b9e71d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7992 8076 bytes

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