Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fd1f2f12cbe579…

MALICIOUS

PDF

45.9 KB Created: 2020-03-29 05:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d9cfe35f1e1e35b8738df4d5e0e80e25 SHA-1: 330e7b4eefa964426540e4dcf5f19fc486f3b4a1 SHA-256: 27fd1f2f12cbe579b08c5c0ba542b6ca978b4e51f80cfa59bc2b74ce505b876f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains text related to 'La cenicienta cuento infantil pdf' and metadata indicating it was generated by wkhtmltopdf. This suggests a link farm or SEO poisoning attempt, potentially to distribute malicious PDFs or manipulate search results. The ML classifier strongly supports the malicious verdict.

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://www.myshopblackburroclayworksgmail.com/uploads/1/3/1/3/131398416/131398416.html#la+cenicienta+cuento+infantil+pdf
    • http://tomkeifer.net/uploads/1/3/0/6/130639467/fd1318d0.pdf
    • http://interstructceilings.com/uploads/1/3/0/6/130620573/649d4eb10.pdf
    • http://halidacatic.com/uploads/1/3/0/5/130540128/memarejejegifa_zuloxerunenib.pdf
    • http://catapultband.com/uploads/1/3/0/6/130639231/ladigafol.pdf
    • http://doctortosch.com/uploads/1/3/0/6/130640063/861751c211fc.pdf
    • http://pranaessentialoils.com/uploads/1/3/0/8/130874221/xifolexafeduwajup.pdf
    • http://www.theemeraldadventures.com/uploads/1/3/0/6/130621682/467769fa9e.pdf
    • http://the-gibbs.jigsaw-group.co.uk/uploads/1/3/0/6/130639310/7418024.pdf
    • http://najwaali.com/uploads/1/3/0/8/130874239/8222055.pdf
    • http://www.effectivemobiledjservice.com/uploads/1/3/0/7/130776587/7726900.pdf
    • http://www.gardenhui.com/uploads/1/3/0/7/130738596/xosiwit.pdf
    • http://michiesdogmeatsandtreats.com/uploads/1/3/0/2/130288731/wakibodoji-ligoxetewaxu-vitivovajafel.pdf
    • http://stoolfeathergames.com/uploads/1/3/0/3/130313356/xarogor-fofex-xosadarisel-nukozefeji.pdf
    • http://hillcountyplungettes.com/uploads/1/3/0/4/130488820/2637706.pdf
    • http://annamariecrowhurst.com/uploads/1/3/0/6/130639298/ac3c3b53eb.pdf
    • http://cpanel.service-netflix.com/uploads/1/3/0/6/130605108/josima.pdf
    • http://eptshikuangzuqiuluntan.f18.ebkf.org/uploads/1/3/0/7/130740077/af75cf.pdf
    • http://roch.ogarajetsproposal.com/uploads/1/3/0/4/130483153/0f04fa3a937aac4.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_off000089bd.bin
1818cbcafd30c271df3f12532b2597a53a089da6615e35667bf536e4446943ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x89BD 8488 bytes