Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fcaf43f039dbbdf…

MALICIOUS

PDF

33.0 KB Created: 2020-04-09 15:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d6fa4e76fbfb8285e3fe751d61589cc4 SHA-1: b095f50bdcfb3e990c9482d39bd5a25bd9994372 SHA-256: 2fcaf43f039dbbdfc0e2ec72714d036fd1fbf9195a31f2c86514af9cd8dc8904
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated SEO-style links pointing to other PDFs. The document body also contains a lure for free movie access, directing users to a specific URL. This indicates a link farm or SEO poisoning attack designed to drive traffic to malicious sites, likely for malware distribution or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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://multistreams.com/uploads/1/3/0/8/130814193/130814193.html#long+walk+to+freedom+full+movie+online+free
    • http://blackbusinessunite.com/uploads/1/3/0/8/130814448/fa2863d3.pdf
    • http://stonemoon.shop/uploads/1/3/1/4/131453193/gitukidokonigoner.pdf
    • http://h-anon.org/uploads/1/3/1/3/131384714/topamogod_gofizaxepananu_petewu.pdf
    • http://kasimreed.org/uploads/1/3/0/6/130620966/6266e9e9.pdf
    • http://graciusphoto.com/uploads/1/3/0/4/130483866/164139b749.pdf
    • http://print2infinitystudio.ca/uploads/1/3/0/6/130604850/basixazanufe.pdf
    • http://ablowe.com/uploads/1/3/1/4/131406930/f46b2d8b276.pdf
    • http://l-arginine-supplement.com/uploads/1/3/0/4/130483868/1526583.pdf
    • http://delismurf.com/uploads/1/3/0/6/130621135/rekuv.pdf
    • http://listenlivehsv.com/uploads/1/3/0/6/130620951/kemozofepor.pdf
    • http://octonium-projects.com/uploads/1/3/0/9/130968985/kajivowuriduz-gaxurir-varigobosiku.pdf
    • http://harmoniccollective.com/uploads/1/3/0/7/130738650/jagesezuvefefiv.pdf
    • http://truckrepairminneapolis.com/uploads/1/3/0/4/130477979/tifexasemesewopij.pdf
    • http://jeffmaconconstruction.com/uploads/1/3/1/4/131408092/powuwalomaxuzef_nejilivufexazol_bogulevef_sawepavav.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_off00005acf.bin
51f7f04b1d794e207afce7c2ead85870d2234fb848d60d343c60327d1df41bdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACF 7372 bytes

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