Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd07476a10c638e…

MALICIOUS

PDF

38.3 KB Created: 2020-06-02 20:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10561406642acb3284cffed0d58eddf5 SHA-1: ad4536725e6b54a297e80c78e15f3328fbac6976 SHA-256: 3cd07476a10c638efa0ac759740b609f029d34c5dde5adb0a3455ee960269409
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many pointing to similarly structured URLs on different domains. This pattern is indicative of a link farm or a mechanism to distribute malicious content across many sites. The ML classifier strongly supports the malicious verdict. No scripts were extracted, so the exact payload delivery is not discernible, but the intent is to redirect the user to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://lifelongdrop.com/uploads/1/3/0/5/130543840/130543840.html#i+live+alone+episode+guide
    • http://webdisk.seakapparel.com/uploads/1/3/0/4/130436049/busifejodonufuxas.pdf
    • http://commercial-fountains.com/uploads/1/3/0/5/130539449/jokarirugaf.pdf
    • http://wheelsfleet.com/uploads/1/3/0/8/130814050/tiwesorox_bunuto_zosalid.pdf
    • http://edinburgh-weekends.com/uploads/1/3/0/4/130483558/vejebagos.pdf
    • http://servingslore.com/uploads/1/3/0/6/130620818/werinid_madasomi_xuwato_jifosetike.pdf
    • http://bestgifts4them.com/uploads/1/3/1/0/131070843/kalanezudag.pdf
    • http://lifelongdrop.com/uploads/1/3/0/5/130543840/terms.html
    • http://lifelongdrop.com/uploads/1/3/0/5/130543840/dmca.html
    • http://lifelongdrop.com/uploads/1/3/0/5/130543840/policy.html
    • https://vofexatid.files.wordpress.com/2020/06/17283224022.pdf
    • https://dabujekikun.files.wordpress.com/2020/05/ganixadogaga.pdf
    • https://rejexurubik.files.wordpress.com/2020/05/18617895933.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066f2.bin
ad286aa02d71c6c08b76046aaf396309468024e32a0fea187d5a05bae1d65434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F2 11800 bytes

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