Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab8b98bba717ef3…

MALICIOUS

PDF

40.8 KB Created: 2020-04-02 07:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4e29aa7f149d3b4f5ef215f436466bf SHA-1: b9f9ed9a6f5123a7ed934b8b45456f5589b309f5 SHA-256: 3ab8b98bba717ef3660b5f1329b59a6fd8bf30e0f4030857ed41cb4e86cb1769
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, with a high density of external URLs pointing to other PDF files. The ML classifier strongly indicated maliciousness. The primary attack pattern involves leveraging these numerous links, likely to manipulate search engine rankings or to distribute further malicious content. No scripts were extracted, limiting the analysis of direct payload execution.

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://emilyfariel.com/uploads/1/3/0/6/130639129/130639129.html#eskapar+nifuroxazida+para+que+sirve
    • http://samanthaishere.com/uploads/1/3/0/3/130312974/662beaf1de.pdf
    • http://celebrationsbyakilah.com/uploads/1/3/0/7/130739416/tejagexopujoka_gisesotox_tudajeva.pdf
    • http://vanvolleyleague.com/uploads/1/3/0/2/130289686/dobepevuzu-wedibigiputo-mesonirifitilur-podole.pdf
    • http://mbspangea.com/uploads/1/3/0/3/130313422/tilurozimesave-biwazadavuxi-negupuzom-rufukanapekox.pdf
    • http://ukm-hq.com/uploads/1/3/0/5/130541327/1549747.pdf
    • http://teamfitgems.com/uploads/1/3/0/8/130874330/199a513faec.pdf
    • http://7quaildrive.com/uploads/1/3/0/7/130776254/4728555.pdf
    • http://primrebelle.com/uploads/1/3/0/6/130620614/5d08d1310de4.pdf
    • http://stealthtv.com/uploads/1/3/0/7/130776589/tejenifotitur.pdf
    • http://localbeautyrun.com/uploads/1/3/0/3/130313316/a16eec7966.pdf
    • http://nbboatcleaning.com/uploads/1/3/0/5/130542692/0e17f7274a6.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_off000071fc.bin
9536e6337319f2e9a49b49424234ec3b010dc33e6e4621e46178246cdccec584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71FC 9592 bytes

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