Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa148c1f88f3b723…

MALICIOUS

PDF

44.3 KB Created: 2020-06-05 03:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc7acc213f8b03e338a3d3d68b2b0e3b SHA-1: 9b2bc0594f51fe64c9be7d31d51c2f8ca08d633c SHA-256: aa148c1f88f3b72351468cdbb331acb7c2cd62d74e0fd236994e6aba7e18298f
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The primary lure appears to be related to downloading 'One Punch Man season 2 episode 11'. The embedded URLs suggest a link farm strategy to distribute malicious PDFs.

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://taiyangchengmsc33.br3h.com/uploads/1/3/0/4/130488229/130488229.html#one+punch+man+season+2+episode+11+download
    • http://divinekeyministries.org/uploads/1/3/0/3/130313158/9649822.pdf
    • http://europeandeliriumassociation.com/uploads/1/3/0/2/130289224/cf5f833a57.pdf
    • http://rklipp.com/uploads/1/3/0/2/130287847/tujufobivivew.pdf
    • http://innovativerdinc.com/uploads/1/3/0/9/130969312/6251003.pdf
    • http://balletbelle.co.za/uploads/1/3/0/7/130739155/4919314.pdf
    • http://nextgensoftball.com/uploads/1/3/0/7/130775903/vezilebidomumu_jexeguta_soberob.pdf
    • http://imaginefamilyministries.com/uploads/1/3/0/8/130873851/5789234.pdf
    • http://olliehinkleheartfoundation.com/uploads/1/3/1/6/131606101/janugegu.pdf
    • http://minervaslab.com/uploads/1/3/0/9/130969235/kalukoboxugot-norawajuwa.pdf
    • http://steelwarecentral.com/uploads/1/3/0/6/130620387/36690c37a3b4.pdf
    • http://handleysrin.org/uploads/1/3/0/2/130272513/699676b6086ae5.pdf
    • http://mta-sts.mx.blushnbashful.com/uploads/1/3/1/4/131453499/rumuja_sogodegagakiso_pavisodilesadub.pdf
    • http://mach1now.com/uploads/1/3/0/5/130539428/d60b9c39b6403.pdf
    • http://taiyangchengmsc33.br3h.com/uploads/1/3/0/4/130488229/terms.html
    • http://taiyangchengmsc33.br3h.com/uploads/1/3/0/4/130488229/dmca.html
    • http://taiyangchengmsc33.br3h.com/uploads/1/3/0/4/130488229/policy.html
    • https://mirexudokof.files.wordpress.com/2020/06/duxukaxubuwofaxalijoj.pdf
    • https://luziwux.files.wordpress.com/2020/06/10922131074.pdf
    • https://sisafuwit.files.wordpress.com/2020/06/10460492718.pdf
    • https://pigeliw919772726.files.wordpress.com/2020/06/88491114605.pdf
    • https://rilaxenatime.files.wordpress.com/2020/06/zevumunox.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_off0000804e.bin
41a53d892633ce1df96dd8fda6b944ff23fcd6d7e907efa36e0595e64776a4e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x804E 10752 bytes