Malicious PDF — malware analysis report

Static analysis result for SHA-256 977e1db43aea9e59…

MALICIOUS

PDF

51.5 KB Created: 2020-05-13 10:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4428da003ec4a9c368b41a4fb67bd7e SHA-1: be2f9c1de618cbe016843c1d9844dd1a75c6d5ee SHA-256: 977e1db43aea9e5969c56c81d78318027a58e6d9ef1084a1282b071d33201d90
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to other PDF files on various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. The document body text, though heavily obfuscated, contains a URL that appears to be the primary lure. No scripts were extracted, limiting the analysis of direct payload execution.

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://kips-trips.com/uploads/1/3/1/4/131406687/131406687.html#open+source+cross+platform+2d+game+engine
    • http://morrisandsilvester.com/uploads/1/3/0/6/130639929/buluvakajot.pdf
    • http://farnorthexposure.com/uploads/1/3/1/4/131407008/d1fbbc183f98.pdf
    • http://kindredbrew.com/uploads/1/3/0/7/130775201/5271231.pdf
    • http://adamswig.com/uploads/1/3/0/2/130272333/vemawagawekovolegoj.pdf
    • http://ndhumanities.com/uploads/1/3/0/5/130546333/3893246.pdf
    • http://derrickgardnerphotography.com/uploads/1/3/1/3/131383269/fegopuxipilaribido.pdf
    • http://mipsbot.info/uploads/1/3/0/5/130539923/naxisasiw-nipev.pdf
    • http://tradedevelopmentservices.com/uploads/1/3/0/5/130589305/kizujax_juxivopupevude.pdf
    • http://vancouverislandsafari.com/uploads/1/3/0/8/130814112/kuvis.pdf
    • http://mountainandmed.com/uploads/1/3/1/4/131407386/6341627.pdf
    • http://projectbridgethegap.com/uploads/1/3/1/4/131438477/begivixijofiner.pdf
    • http://plantsforpermaculture.com/uploads/1/3/0/6/130620627/c7d35e8bd1a83b.pdf
    • http://thedinnerprojectshow.com/uploads/1/3/0/5/130544043/4626689.pdf
    • http://dfaofficial.com/uploads/1/3/1/6/131636951/pajeporidawe-foxiw-bakizajuzaz-limaluno.pdf
    • http://erinahlenrooney.com/uploads/1/3/1/3/131378840/fakalokomun_gazikesof.pdf
    • http://fjbinc.com/uploads/1/3/1/3/131398156/8473939.pdf
    • http://nakedtruthbank.com/uploads/1/3/1/3/131379781/4507892.pdf
    • http://coolandgroovymakeup.net/uploads/1/3/0/3/130313203/3642565.pdf
    • http://acs-kw.com/uploads/1/3/0/6/130639209/3111196.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_off00008edc.bin
59f58c16d9459089491be0813d8afa0c1841fc46a29af9b28d92812ec6fa205f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDC 3484 bytes
font_01_sfnt_off00009c3e.bin
9c15cc269fa2dd7333e3e71864babe6fcecf00cf8c34b33719bf447cd38a2bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C3E 10848 bytes