Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99a6330b4ea311a…

MALICIOUS

PDF

46.5 KB Created: 2021-06-13 16:14:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b40d867affec2398b1763661645dd754 SHA-1: 253e97f52af0285500c490c46e48309640493f19 SHA-256: f99a6330b4ea311aea25ba332a6ac8dd9517a037c243333851ec970380c3adc1
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://netcdn.co/app/431946152/como-hackear-cuentas-de-roblox-como-amon-game-hack PDF link annotation
    • http://svadba-moda.kg/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://svadba-moda.kg/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://svadba-moda.kg/images/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://svadba-moda.kg/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://svadba-moda.kg/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://svadba-moda.kg/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/how-to-join-anyone-on-roblox-hack_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/banning-a-hacker-lol-roblox_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/fly-vehicle-roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/roblox-business-simulator-cheat_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://svadba-moda.kg/images/roblox-how-to-give-self-free-robux_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/free-roblox-stuff-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53AC 26792 bytes
SHA-256: d68ecde3d4d1c3d626397950263ee0cde5d979658a765cbbd72200d582cdd452
font_01_sfnt_off0000919f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x919F 18856 bytes
SHA-256: 1bb6e583e6fa356e565d546d2f2cc385eb89c7d8695c831a60d785079a9d9258

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