Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac04ebb0c2e46de4…

MALICIOUS

PDF

35.5 KB Created: 2020-06-02 19:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb2901e3643eef013f55c12e389fa0a4 SHA-1: 7175c93db80b2bdf1751414d091c0beb1a392905 SHA-256: ac04ebb0c2e46de460a3146f7be16393f60b1de5d709a86b725be2a02025b8e4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing:Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains a large number of embedded external links, many of which point to other PDFs hosted on domains associated with link farms. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm network. The primary attack pattern appears to be SEO-based link manipulation for traffic redirection.

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://thedividedheart.com/uploads/1/3/1/4/131437660/131437660.html#oboe+finger+chart+low+notes
    • http://rustysrusticroost.net/uploads/1/3/0/2/130271184/jotaxobewipifi_tanapi.pdf
    • http://bolksteinanderson.com/uploads/1/3/1/4/131437880/zowowunoxa.pdf
    • http://pattenacademy.net/uploads/1/3/0/6/130639181/wovupa-dimoloze-jokufakumomiwaf.pdf
    • http://tulungagung-satu.id/uploads/1/3/0/8/130815437/008cdc.pdf
    • http://heavenlyhappyhandyman.com/uploads/1/3/1/4/131438456/219341636a0a.pdf
    • http://thedividedheart.com/uploads/1/3/1/4/131437660/terms.html
    • http://thedividedheart.com/uploads/1/3/1/4/131437660/dmca.html
    • http://thedividedheart.com/uploads/1/3/1/4/131437660/policy.html
    • https://faxexepa.files.wordpress.com/2020/06/zidon.pdf
    • https://kemekakusava.files.wordpress.com/2020/05/pixutikavelozu.pdf
    • https://suxeniruwip.files.wordpress.com/2020/05/muberupadizusali.pdf
    • https://fimafof.files.wordpress.com/2020/05/98505071156.pdf
    • https://satebelofoxo.files.wordpress.com/2020/06/rovatutuvabosejig.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_off00005e3a.bin
9ac78d25f5caf3ecc30654ed972c88ad64bd64cc02acc12439a2ca555a464d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3A 10520 bytes

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