Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af8685c4257bc65…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 20:10:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 44daf0e7ac7780f28f4b9a065560c3af SHA-1: 19961ae77dffeb425d2357bf0a63074ae50c9f88 SHA-256: 9af8685c4257bc65122c10f9f07e4c8be4508cb01a96996eafe5fe01047f8a04
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that redirect to a known malicious domain, masquerading as a game hack generator. The document body and extracted URLs strongly suggest a phishing or scam attempt, likely to lure users into downloading further malware or divulging credentials. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/how-to-hack-roblox-passwords-game-hack In PDF document text
    • https://lib.bunghatta.ac.id/app/repository/i-got-hacked-in-weird-writing-roblox_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-roblox-merch_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/generate-free-robux-gnome_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/deadzone-roblox-hack_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-free-gamepasses-script_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-free-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-roblox-neclaces_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-mm2-cheats_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/roblox-free-usernames-and-passwords-wolfkami23_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/hack-coin-master-download_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/coin-master-game-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/thomas-and-friends-roblox-free-games_GM431946152.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://lib.bunghatta.ac.id/app/repository/how-to-get-free-robux-by-joining-group-no-buying_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
font_00_sfnt_off00003119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3119 22416 bytes
SHA-256: 07103076a3a148269f65f12a1e1e02c4ef47ec097fc18bab9b34c27c2ae92a42
font_01_sfnt_off00006318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6318 19148 bytes
SHA-256: 27c2480528306c14fc73cab21edc43c1c48bdb6a9d52717524bf8f54e0cb401c

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