Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9a12d4db31fed2…

MALICIOUS

PDF

50.0 KB Created: 2021-06-11 04:01:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 71ac72aecc10ca2feaa5418ee0bf4835 SHA-1: 69caa29421fafe59ef7e68630f6ffbe789dc9483 SHA-256: de9a12d4db31fed23ee8a743ad70d7bee3dbeb6dfcabf90b750e5bb4fdb891e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one that redirects to known malicious infrastructure associated with game hacks and free currency lures. The document body, though partially corrupted, contains references to 'Vuxvux Free Robux' and 'game hack', reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/vuxvux-free-robux-game-hack In PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/inappropriate-roblox_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/100-robux_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/roblox-hack-robux-hack-com_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/free-robux-gift-cards-no-survey_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://dndprinting.com/new/public/ckfinder/userfiles/files/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://direct-link.netIn 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
font_00_sfnt_off0000508b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x508B 27612 bytes
SHA-256: 8365837ec5435aaa8e56d7adbb3e2a1c5f962cc1cdb40ab76e68310238a43e28
font_01_sfnt_off00008f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F75 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off0000a0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E6 18260 bytes
SHA-256: fa8d611751a9ece3e790b4c3447a23f8fd2146f842ac86cf3b32549763af1aef