Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a50b474a0aeeb45…

MALICIOUS

PDF

43.0 KB Created: 2020-05-06 01:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cc00a505bf91d324b2d3b69f7a967614 SHA-1: e418aa280bc6c8c6d68869d8eaf47c94b8a12a96 SHA-256: 1a50b474a0aeeb456fe112cf4ff5edce0f7d5d1c113ba3ee8a96f399c1e66841
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO abuse tactic. The embedded URLs point to various domains, with the primary one being http://canadians.cool. The ML classifier strongly indicated maliciousness. The document body appears to be malformed or heavily encoded, but contains fragments of URLs and metadata related to wkhtmltopdf, indicating it was likely generated programmatically to host these links.

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://massageorangebeach.com/uploads/1/3/1/4/131407424/131407424.html#samsung+j210f+combination+file+free
    • http://canadians.cool/uploads/1/3/0/9/130969706/569693.pdf
    • http://leadingyouhome.org/uploads/1/3/0/6/130604358/gapari.pdf
    • http://phillipphanproperty.com/uploads/1/3/0/6/130639624/f8e34b8b.pdf
    • http://dumpyourjunkremovals.com/uploads/1/3/0/6/130621940/8fbc9.pdf
    • http://vera-rich.com/uploads/1/3/0/9/130968992/wuxupexek.pdf
    • http://arsdoceo.com/uploads/1/3/0/5/130590374/niloj-wojem-gunokavukubat-zevelutogezo.pdf
    • http://michaelthomasessad.com/uploads/1/3/0/3/130313212/4950633.pdf
    • http://ikmdpe.site/uploads/1/3/1/4/131453246/xamuwefego.pdf
    • http://mmastrorilliciv.com/uploads/1/3/0/7/130776073/rewefu-zuwanonoka.pdf
    • http://islandessencejewelry.com/uploads/1/3/0/9/130968961/8362660.pdf
    • http://trufflesliving.com/uploads/1/3/1/3/131398246/riwataxejol_jegasonudise.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00007c53.bin
722dc929a3a5d304f70c1ab0e73123ec0d124bd24507f2e3d1ce5da62821b8c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C53 11028 bytes

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