Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47f66eb6a5cd79c…

MALICIOUS

PDF

37.3 KB Created: 2020-03-14 13:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 242f01256ed02bc283a121f23e7a1528 SHA-1: dfd1bbfb7881e54f01721e96b50eecfcf6a41b1b SHA-256: b47f66eb6a5cd79c069c7c8b1c4adc530d0427c44a90c1e7a428b29b0e5d7cd2
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The embedded document body text, though partially corrupted, contains references to 'Steam' and 'wkhtmltopdf', potentially as a lure or to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://perapalace2018placeholder.devsite-1.com/uploads/1/3/0/5/130539033/130539033.html#steam++restarts+after+pause
    • http://harrietarkley.com/uploads/1/3/0/7/130739081/nejovusesetev.pdf
    • http://myonlinefashionmary.com/uploads/1/3/0/6/130620402/xubamifole-vudexagik.pdf
    • http://dj-eminded.space/uploads/1/3/0/3/130379422/gofuvujopo-serukepiju-rawajonupasewib.pdf
    • http://collegeangelservices.com/uploads/1/3/0/3/130379426/xukesaxetirapezosipu.pdf
    • http://augustusfederal.com/uploads/1/3/0/4/130483783/ac5c2615.pdf
    • http://www.kenbroglobaltech.com/uploads/1/3/0/6/130639839/8307824.pdf
    • http://www.buyon.dadgifts.us/uploads/1/3/0/8/130813428/bakubuxadikakevofe.pdf
    • http://www.wellfordtowing.com/uploads/1/3/0/4/130489371/jijezig-vanawifevosol-diseruwilitiwuk-kujiwedo.pdf
    • http://www.jakeogle.com/uploads/1/3/0/7/130775199/widizurozuxejo_vuduf_rifaxuriv.pdf
    • http://interpreterswithoutborders.net/uploads/1/3/0/6/130604218/fuvef_kubokavubudelaf_duwoket_sipelod.pdf
    • http://thoughtpile.org/uploads/1/3/0/5/130551558/6801642.pdf
    • http://cpanel.gymcreators.com/uploads/1/3/0/5/130588640/32bdfd.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_off00006768.bin
9c134b8adf8dcbeb30669c26f04eb020b339c4bde837d94c962873420ad2105b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6768 8536 bytes

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