Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea1a14cc85fe122…

MALICIOUS

PDF

34.4 KB Created: 2020-05-14 20:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c839b28c9f4b2952db5188e2da1ef16f SHA-1: c259a268c5e8a6046bac60e6809c9a1a9a1633ae SHA-256: 9ea1a14cc85fe122ad29661b148091c92b04157ad4509ce51c664281401f3fb9
94 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious. It contains a large number of external links to other PDF files hosted on various domains, indicating a potential link farm or distribution network. The document body contains seemingly unrelated text and URLs, further suggesting a deceptive purpose. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://megs.studio/uploads/1/3/0/4/130435978/130435978.html#naruto+shippuden+ninja+storm+4+ppsspp+android
    • http://wataugaroofrepair.com/uploads/1/3/0/6/130621516/390f0cc6.pdf
    • http://heimbrothers.com/uploads/1/3/0/6/130639679/726ce69074b5be.pdf
    • http://doughbunstho.com/uploads/1/3/0/8/130813975/badazotipoz.pdf
    • http://h-anon.org/uploads/1/3/0/5/130588257/48b81ff7d2710.pdf
    • http://lawyattconstruction.com/uploads/1/3/0/6/130604812/duzule_gebim_vabod_zipexijezema.pdf
    • http://womens-weight-loss-and-fitness.com/uploads/1/3/0/7/130739233/wupidugodurugox_ketemotode.pdf
    • http://teambyrne.net/uploads/1/3/0/5/130551621/fuvekalolivoji_wikilut_bopovajizaz.pdf
    • http://byalexandrialopez.com/uploads/1/3/0/2/130289630/ripudolenorevis.pdf
    • http://teachtotransformanation.com/uploads/1/3/0/3/130324350/pedulogun-faluremesetepin-resojor-jomiriri.pdf
    • http://vipdroneservices.net/uploads/1/3/0/7/130776331/bf12b2e.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_off00005921.bin
c204086e2a2fcd1c2478de984cbb4b506103e778e76278a457fd791d7a0aab12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5921 11180 bytes

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