Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c43f0510dfb99ad…

MALICIOUS

PDF

34.3 KB Created: 2021-07-09 12:03:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 50c9f26a05aab3aa758d3d974b60efe6 SHA-1: e56f0197237b7fb140369fe0db1ea86c35b67fe5 SHA-256: 4c43f0510dfb99ad870140262e37f946248f01b57ea3215bb163c647aec8e562
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are designed as SEO link farms for game hacks and free in-game currency. The primary URL http://netcdn.tw/app/406889139/coin-master-free-spins-promo-code-game-hack appears to be a redirector for a game hack generator. This indicates a social engineering tactic to lure users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/406889139/coin-master-free-spins-promo-code-game-hack PDF link annotation
    • https://vierabyragazze.com/upload/files/free-robux-generator-online-no-survey_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-do-you-get-free-robux-on-pc-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/hack-roblox-tools_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-noclip-no-cheat-engine_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-any-roblox-item-for-free-2021_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-admin-2021-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/get-free-gear-in-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-buying-2021000-robux-hack_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/robux-hack-generator_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_002_off00002f78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F78 22556 bytes
SHA-256: 78157cc4de5a5480139302e65899fff882c1c564ab8a544607635935ea0d631e
font_01_sfnt_off000061e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E5 18760 bytes
SHA-256: f19908f223f6d81612d6a2bf6f73a33e849f8235d54350b1f471ed781f00ccd8

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