Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7d09cd83d952a8…

MALICIOUS

PDF

39.4 KB Created: 2020-03-28 06:16:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1bf7560e9d3f8d111486744145b192f4 SHA-1: 2ce4a1f3919a4f7738317c2d6bb88e9dbc70e236 SHA-256: 3a7d09cd83d952a8803b3fc229db865337f7ac351014d34e9661bb5458b70469
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1598 Gather Victim Identity Information

The PDF contains a large number of external links to various domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The embedded URLs suggest a tactic to distribute content or manipulate search engine results, potentially leading to further malicious activity.

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://adventuresbyprice.com/uploads/1/3/0/4/130477890/130477890.html#division+de+varias+fracciones+con+diferente+denominador
    • http://dev.warrnambooltoylibrary.org.au/uploads/1/3/0/3/130379718/15adff192f1c.pdf
    • http://www.bush-film.com/uploads/1/3/0/5/130550652/6867436.pdf
    • http://bikseriet.com/uploads/1/3/0/7/130739311/befatowafunalu.pdf
    • http://cpanel.eventsforafrica.com/uploads/1/3/0/6/130605269/9889563.pdf
    • http://authorkmdylan.com/uploads/1/3/0/6/130621581/lufelana.pdf
    • http://westcoastmarinelimited.com/uploads/1/3/0/6/130639845/xupodomoraxix.pdf
    • http://noakiespecracing.com/uploads/1/3/0/9/130969604/5975093.pdf
    • http://lindaknappett.com/uploads/1/3/0/2/130287419/wodiliwetet.pdf
    • http://care4simply.com/uploads/1/3/0/5/130539450/5700075.pdf
    • http://rebieramoso.net/uploads/1/3/0/7/130738543/e42d223332a16c4.pdf
    • http://assistensepay.live/uploads/1/3/0/4/130488252/fapazap_kegomuf_wobevewegufif.pdf
    • http://2moco.com/uploads/1/3/0/5/130551750/wejiladusanevo-kafoxix-nopaboludutuki-vupujuwoz.pdf
    • http://cathacollection.com/uploads/1/3/0/4/130435670/jewedenekabip.pdf
    • http://ptaassociates.com/uploads/1/3/0/6/130621485/nupuvizug-fulesez-rixovugafagawe.pdf
    • http://roomshakerrecords.net/uploads/1/3/0/6/130621020/juzob.pdf
    • http://www.mrsweathersbysweb.com/uploads/1/3/0/6/130639679/75fb133.pdf
    • http://fallingintoclay.com/uploads/1/3/0/4/130483050/2914f2f4684571.pdf
    • http://server65281.misscarols.com/uploads/1/3/0/8/130874362/9fa85bbc892d1e.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_off00006d1e.bin
285df974f9b3ae43cafb6c9b783bfb08c5f524fab0846f0853498beaba761b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1E 8956 bytes