Malicious PDF — malware analysis report

Static analysis result for SHA-256 be7b188d4d0dcc00…

MALICIOUS

PDF

43.3 KB Created: 2021-05-14 14:05:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf489ddae4224263ddec959f5c0e03a5 SHA-1: 95954f2fb72016d02b2933dcff143e5fb4b96691 SHA-256: be7b188d4d0dcc006569b5c4a1f2a92436e97f99ff6974874bb38b4aa1d9329e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs designed to lure users with promises of game hacks and generators. The primary lure URL is https://netcdn.xyz/app/431946152/free-roblox-hack-us-game-hack. The document body and heuristics indicate a link farm strategy, likely intended to drive traffic or distribute further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/431946152/free-roblox-hack-us-game-hack PDF link annotation
    • http://interpretation-dessins-enfants.net/images/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/play-minecraft-free-online-no-download_GM479516143.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/mcpe_GM479516143.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://interpretation-dessins-enfants.net/images/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C38 25124 bytes
SHA-256: e861be05705d659cb1a274f759293f4e882cdf5cbc1a489c4314f9fcddbf6239
font_01_sfnt_off00008639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8639 18532 bytes
SHA-256: 0d34e375d8902d3efa285fd24fab142d003833d4205c7dc9a730d4d831678389

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