Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55e79b85365ee3b…

MALICIOUS

PDF

47.3 KB Created: 2021-06-08 18:42:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f395fd41829fc9d52ea70483856ab5b SHA-1: ad45a107aec5af68fdf22be187fd10a10b5670d3 SHA-256: b55e79b85365ee3bdc83013d8cf21bd3a88922907607135924ae49ab9b3c1d74
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9769

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/how-to-get-free-character-in-roblox-game-hack PDF link annotation
    • https://www.psychotherapie-naturheilpraxis.de/images/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/with-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/free-robux-app-android_GM431946152.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/mcpe-116_GM479516143.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/appsmob-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/infinity-rpg-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/free-gamepasses-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • https://www.psychotherapie-naturheilpraxis.de/images/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005293.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5293 24464 bytes
SHA-256: 14520c6894e3259c54f71d8bf2bb641a549ce5999d002bdd45f475ed36d781ad
font_01_sfnt_off00008b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B08 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000094f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94F3 18608 bytes
SHA-256: d24f98eb9599fa8d946f5a65738e0544928195fdc7be14621dbc6c86063bf056

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