Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe99f73d4bd9e923…

MALICIOUS

PDF

34.9 KB Created: 2021-07-10 01:48:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dadad8df3ee67b7cffda4e91bdf75b15 SHA-1: d65992fd6a54e389ba26dcf87583ba0f71a49bf2 SHA-256: fe99f73d4bd9e9236b723888c37eb685f9146550166a2154b5e6ce1776c60856
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/coin-master-free-spin-and-trading-game-hack PDF link annotation
    • https://www.astrospace.com.tw/upload/files/free-robux-app-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/roblox-dance-your-blox-off-cheats_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/clockingshades-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/did-roblox-get-hacked-in-2021_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/cheat-engine-roblox-67_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-hack-someone-roblox-account-2021-july_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/roblox-super-noob-obby-cheats_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/cheat-engine-64-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-tiktok-views_GM835599320.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/roblox-hacks-extensions_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/how-to-get-money-in-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.astrospace.com.tw/upload/files/free-coin-master-hack-no-verification_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_002_off00003357.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3357 22476 bytes
SHA-256: 2dbbc9a145e8ade92c6e8d5953b72a9e731dc85338d73c0913c58dec8d870563
font_01_sfnt_off0000656e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656E 18348 bytes
SHA-256: 3321b442349ec3fbeffa6c99ea757bca325654330b1776a80a606c1f7099e679