Malicious PDF — malware analysis report

Static analysis result for SHA-256 b844cff84d7293d9…

MALICIOUS

PDF

44.4 KB Created: 2021-06-07 05:05:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0ff85a0990b507d736512f39f4382a07 SHA-1: 64d0ae39ca29a189991c652b575e8d8f7f2e071e SHA-256: b844cff84d7293d996051a2d26c5754bcce4d91903e48a8b63d059a0c2737b24
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9865

Heuristics 4

  • 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.tw/app/431946152/free-roblox-plaza-money-game-hack PDF link annotation
    • http://razredna-nastava.net/files/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/rbxdemon_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-imagine_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/clients-minecraft_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/cpbildco-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/daily-free-coin-and-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-how-to-speed-and-fly-hack_GM431946152.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_004_off00005217.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5217 24696 bytes
SHA-256: b50e9c494e636e9c365309ba9509046aa0291b32cd94fd7955094a480dce873b
font_01_sfnt_off0000896d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x896D 18788 bytes
SHA-256: c83527dbfc526171b661933eb11ab85cbf79830deee70b26b38894f9b4bfbd93

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