Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4faa1dab7d7c92c…

MALICIOUS

PDF

45.8 KB Created: 2020-03-30 02:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2d61aac77d5af8ffd300db5b51d27d7 SHA-1: 1f9c45cdc91c7125d4424f495e05772e6ec36290 SHA-256: b4faa1dab7d7c92c8ce0fe8881102c67cb15292faa1b59fbcd92c69cf7685e3a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a link farm, containing a large number of external URLs pointing to other PDF files. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious pattern of mass external linking. The embedded URLs likely serve to distribute malicious content or manipulate search engine rankings.

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://carpetcleancary.com/uploads/1/3/0/4/130483833/130483833.html#caracteristicas+de+una+red+wan
    • http://automotiv.org/uploads/1/3/0/5/130588905/talepetanugogaguj.pdf
    • http://hellogorgeousky.com/uploads/1/3/0/6/130605036/8317505.pdf
    • http://facilitationgrandeurpropre.com/uploads/1/3/0/7/130776602/dutulegulunugemijo.pdf
    • http://www.natbayley.com/uploads/1/3/0/9/130968911/xaletot.pdf
    • http://peaceandlovegranola.net/uploads/1/3/0/4/130483519/a471c665bba.pdf
    • http://rainierviewconstruction.net/uploads/1/3/0/5/130538997/5374664.pdf
    • http://the5talentsstore.com/uploads/1/3/0/2/130270783/kikasezevutedegos.pdf
    • http://seanqiao.com/uploads/1/3/0/7/130775624/gadolekozelumila.pdf
    • http://carolea-prima.eu/uploads/1/3/0/6/130640023/bfd7c93.pdf
    • http://bigcitystrangers.com/uploads/1/3/0/5/130542866/67061eb3fbe812.pdf
    • http://jacksonlisle.com/uploads/1/3/0/6/130622025/14add6384a.pdf
    • http://capecoralclones.com/uploads/1/3/0/4/130488401/moxefukemujodal.pdf
    • http://laocan.org/uploads/1/3/0/4/130435716/linajum.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_off000086ed.bin
a902b155e99dc80f07a61663cd322eb18832e4f5430fd42987c36c587eb3fc59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86ED 10424 bytes

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