Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a48f4ee16424759…

MALICIOUS

PDF

48.3 KB Created: 2020-06-03 20:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d9b7c47a781bda1897466f2f76bc46d SHA-1: bbb0782cb4c3af121cbf5a400efaa780757cfc6f SHA-256: 2a48f4ee164247594b441933f44aa74efe4aaa849aeb2c9c37f5c83e98485bb6
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF documents. The document body contains text related to downloading ROMs, suggesting a lure to attract users. The PDF_SEO_LINK_FARM heuristic firing indicates a high volume of external links, likely for SEO manipulation or distribution of further malicious content. The ML classifier strongly flagged this PDF as malicious.

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://performancemedicalsolutions.com/uploads/1/3/0/7/130776452/130776452.html#download+gba+roms+pokemon+sun+and+mo
    • http://triamantbluezone.com/uploads/1/3/0/7/130776558/vutotosezokuze_popuramikopom.pdf
    • http://mx.glummonkey.com/uploads/1/3/0/3/130323968/kufijenag.pdf
    • http://w-contractors.com/uploads/1/3/0/6/130621196/neterer.pdf
    • http://atomicdog.shop/uploads/1/3/0/2/130272903/396744.pdf
    • http://stellacrawford.com/uploads/1/3/0/3/130324351/1657206.pdf
    • http://konfirmesyens.net/uploads/1/3/0/5/130551708/bccf3.pdf
    • http://sweetiesveganbakery.com/uploads/1/3/0/4/130489070/rurosalazorukavu.pdf
    • http://autodiscover.eyevisiondowntowndenver.com/uploads/1/3/0/7/130739553/fuvatemefatola.pdf
    • http://cdhfiberart.com/uploads/1/3/1/4/131406806/651404.pdf
    • http://mta-sts.nvtf1.org/uploads/1/3/0/6/130604470/36d491011.pdf
    • http://bookstem.com/uploads/1/3/1/4/131407459/9bac285.pdf
    • http://valokuvauskirsi.com/uploads/1/3/0/6/130605173/dabewilozuvari-xilazuk-nonus.pdf
    • http://lezlymadrigal.com/uploads/1/3/0/6/130620348/3c513a2e3bf6f9b.pdf
    • http://performancemedicalsolutions.com/uploads/1/3/0/7/130776452/terms.html
    • http://performancemedicalsolutions.com/uploads/1/3/0/7/130776452/dmca.html
    • http://performancemedicalsolutions.com/uploads/1/3/0/7/130776452/policy.html
    • http://w-contractors.com/uploads/1/3/0/6/130
    • https://rutaxitulos.files.wordpress.com/2020/05/kajuridinapamudetur.pdf
    • https://ximijolis.files.wordpress.com/2020/06/27237470022.pdf
    • https://zujulesi.files.wordpress.com/2020/05/gizerusuvipakop.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000794b.bin
91ee86d8da7e218164003679a79ce5304b1003147b95a3a420c545430fd1f012
pdf-font-stream PDF embedded font (sfnt) at offset 0x794B 11232 bytes
font_01_sfnt_off00009f3e.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F3E 16204 bytes