Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b00b627f2b0fb3…

MALICIOUS

PDF

48.4 KB Created: 2021-06-07 12:20:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b5ecb3db7fe84dabcb717173594554e2 SHA-1: 4910d3c7381ebb3042c2cf44a2963d844db713e9 SHA-256: 99b00b627f2b0fb325e4bcc3c3606fda5504e6ff8fb84104e7bfc9872b6d2558
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 0.9796

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-robux-cards-live-game-hack PDF link annotation
    • http://huananhai.net/images/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/robux-gainer_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://huananhai.net/images/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • http://huananhai.net/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000512d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x512D 25392 bytes
SHA-256: 873f1224cfc90c3ef2080cd5cd1db182486d625a73d29cfcf0b217534b953ee3
font_01_sfnt_off00008c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C11 5756 bytes
SHA-256: a7a69a356750c58f853193ac64834dcf3e4080fc2a8f6e9107645a696c81e11e
font_02_sfnt_off00009962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9962 18648 bytes
SHA-256: 1925a912ab316573e83593709a8fde9e582d13ff387ccad32daf8fa28583bc91

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