Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77814c635525bf3…

MALICIOUS

PDF

35.7 KB Created: 2021-07-07 19:59:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 41cf4b623b400c2181284ceaca20bc09 SHA-1: 827523936f49d16015528e54fdf8f705619c6779 SHA-256: f77814c635525bf3e70a33f83b483ca864813e4fe47563b0d7aa02be7cccc896
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 0.9980

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 http://netcdn.tw/app/406889139/today-coin-master-spin-free-game-hack PDF link annotation
    • https://3qblocks.com.tw/image/data/files/free-roblox-royale-high-outfits_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-no-human-verification-2021-or-survey_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/pubg-uc-live_GM1330123889.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-no-inspect-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/hack-for-roblox-bee-swan-sumlaitor-may_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/roblox-hacks-and-cheats-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-game-packs-for-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-roblox-account-generator_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/robux-cheat-no-survey_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-dominus-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/free-builders-club-inspect-roblox_GM431946152.pdfIn PDF document text
    • https://3qblocks.com.tw/image/data/files/get-free-robux-no-inspect_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_002_off000032ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32FF 23520 bytes
SHA-256: 7c4e33a5beb3979212c00667f7b9c15bb502b8661e500bede1355ddaed3e61df
font_01_sfnt_off00006841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6841 18528 bytes
SHA-256: e2ba7301b642d01bbb1534f76a73ee61ba5af41067a1fa1e156a956a78038ecf

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