Malicious PDF — malware analysis report

Static analysis result for SHA-256 8525acd5b627a5a2…

MALICIOUS

PDF

47.2 KB Created: 2021-06-09 06:29:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b2b0277e6140bbd58e4a245a4907669c SHA-1: 26e38c299d5b96cb2df9c017ab21c1d4bb48ec09 SHA-256: 8525acd5b627a5a24595259a1de8910c6d897dbb0dc6b5b4ea570333e89b9540
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are presented as game hacks or generators, indicating a lure-based attack. The presence of a fake CAPTCHA heuristic further suggests an attempt to trick users into performing an action that could lead to compromise. The document's structure and embedded links align with common tactics for distributing malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/how-to-hack-roblox-in-poison-game-hack PDF link annotation
    • http://sbm-nn.ru/images/spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-without-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-reddit_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-hack-people-item-in-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-fan-page-facebook_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f98.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F98 25456 bytes
SHA-256: e22aef4da159d7283d3ab11c8df22ca052bae245a228f3bf27a358ad03a4816f
font_01_sfnt_off00008b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0B 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000094bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94BB 18620 bytes
SHA-256: a4286126a4130cfc8d332f821a873b7129bbd5e3af74a64f424665fe76f61bb8

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