Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40f61238a76e69c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 11:04:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0a3ff46ad42cfcbc71abf3c8b76ac48c SHA-1: 3f1a3b627e1ce005458e39205c2116e907dfad64 SHA-256: b40f61238a76e69cad3e4ecc698741fbdc483e47aeae2a203cd20188c19849ae
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/free-spin-in-coin-master-game-hack. This redirector is likely used to deliver a secondary payload or phish for user credentials. The document body and embedded URLs strongly suggest a lure related to game hacks and free in-game currency, a common social engineering tactic.

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/406889139/free-spin-in-coin-master-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/cheat-codes-for-roblox-xbox-one_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/5-million-robux-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-meep-city-free-plus-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-survoivr-in-roblox-pc_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-meep-city-money-cheats_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-re_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-money-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/rbxoffers-com-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-codes-for-roblox-mineing-sim_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-without-robot-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-hacks-real_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_off0000312d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x312D 23092 bytes
SHA-256: 106f9b2848e184a6b99138705ef1dad5ff690c0c79e55a0be6182ecab5ed8d7c
font_01_sfnt_off000064f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F9 18176 bytes
SHA-256: 71b70257de5307608e837e84baf22dba423b8b66b5dab801bbeeadacf24eb5d5

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