Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeef54633a85ddf8…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 09:15:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 39f57aa5f4d85f543078d57e913966ee SHA-1: 0173f7e6bd586f27f7db1966cc79361574904199 SHA-256: aeef54633a85ddf8ab28888dff05dabe37beca9c1a1a6276b794623d94c1da9e
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a common lure of game hacks and free currency to entice users. It contains an external URI pointing to 'netcdn.tw', which is flagged as a game hack redirector. This suggests the PDF is designed to lead the user to a site that will likely attempt to download a second-stage payload or exploit a vulnerability. The ML classifier strongly supports the malicious nature of this PDF.

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/479516143/mcpe-optifine-game-hack PDF link annotation
    • https://fib.ub.ac.id/sac/repository/free-candy-decal-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-super-happy-face-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hacked-skybox-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-girl-hair-not-a-model_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/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-source_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-id-reedem_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/is-coin-master-hacks-safe_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/robux-free-online_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-roblox-skins-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-coin-master-hacks-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
font_00_sfnt_off00003056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3056 23000 bytes
SHA-256: ee3eb4e28a425251615272049054f5e624b1c7ebd4e1c5045bc7b9d9861d2090
font_01_sfnt_off000063fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63FA 18032 bytes
SHA-256: 4281d751d044eda5a0802c92c9bf6cf900aad7f4c7ac23413fbf7cf459a64227

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