Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9db8c31a69187ba…

MALICIOUS

PDF

38.2 KB Created: 2020-03-16 06:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc012dedcc589c8a7d52ecc8fbf5bf94 SHA-1: dc2dc990dd543f93d19326f16ac7f4d6b2746caa SHA-256: c9db8c31a69187ba7eca3aa4f44eb2c14ea4093040b54eb771b2107fc3984723
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded document body text, though partially corrupted, contains URLs that are part of this link farm. The primary attack pattern appears to be SEO manipulation or a link distribution scheme, potentially leading to further malicious content or phishing sites.

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://host124.carmichaelnl.com/uploads/1/3/0/2/130272084/130272084.html#guides+gamepressure+hitman
    • http://everycolorsapphire.com/uploads/1/3/0/2/130270958/zomad.pdf
    • http://www.nicacaster.com/uploads/1/3/0/2/130274319/memuxubokanes_rakusijake.pdf
    • http://www.memorylanespaessentials.com/uploads/1/3/0/8/130874281/5824909e1a5d8d2.pdf
    • http://www.stellarroseboutique.com/uploads/1/3/0/7/130740087/4848371.pdf
    • http://servingmylord.org/uploads/1/3/0/8/130813399/rugorofukipuge-lewubozopedarod-tupijeje.pdf
    • http://hemphollow.org/uploads/1/3/0/7/130739539/2874202.pdf
    • http://leemarksafety.co/uploads/1/3/0/5/130551611/makida.pdf
    • http://realfastservices.com/uploads/1/3/0/5/130588382/944d7bb797.pdf
    • http://shutouttraining.com/uploads/1/3/0/5/130589415/sigafafezitozuzijup.pdf
    • http://karenwaldron.com/uploads/1/3/0/7/130775014/fapepujemera_jalipexurur_jelesu.pdf
    • http://www.identifur.com/uploads/1/3/0/6/130604244/ecc00e54.pdf
    • http://biztagram.com/uploads/1/3/0/2/130291416/3d5f17b2930c7bc.pdf
    • http://staceylytle.com/uploads/1/3/0/6/130604320/c64c7c.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_off00006cd2.bin
954925a3bfed217e9a805b2f6e4eed64b4f105db047e4be29cf817fc720a6042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD2 8052 bytes

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