Malicious PDF — malware analysis report

Static analysis result for SHA-256 2894ceb8f9b5f17e…

MALICIOUS

PDF

39.0 KB Created: 2021-07-04 02:43:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 142c07f33d9695c7dec2744d2110d751 SHA-1: 198b4b6c769c43aa22bbaf896139a2c314c1046d SHA-256: 2894ceb8f9b5f17e2d61bfde61bb4f87f61e78f9dc1cede7ad96c4df3005292c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games like Coin Master and Roblox. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to these redirectors, likely to deliver further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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/406889139/coin-master-free-link-2021-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/dfield-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/cheat-engine-table-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/get-free-obc-in-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hack-discord_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/apps-on-that-can-hack-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/objet-roblox-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-games-working_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-download-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-use-pastebin-hacks-to-swear-in-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/well-hack-net-roblox_GM431946152.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_002_off000035a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35A3 23488 bytes
SHA-256: 4f812f7556c89a2972e139f48052193f3114c16e80ae2475ed198e2a45f45176
font_01_sfnt_off00006ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD4 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off000074b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74B9 18568 bytes
SHA-256: 5c6f2b8c8950227f34c0c7c762a0319831c5dcbb819f0110f1dbfe9ff8d1e338

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