Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dcfc2532d93395…

MALICIOUS

PDF

46.5 KB Created: 2021-06-08 21:09:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8fcb5078304d9dbacfe824bab1749a09 SHA-1: 16b012feb38b5e4a74ca4c57ee6c20446fcab6ad SHA-256: 86dcfc2532d9339598372b494d7d3aaa780b8aaa16b12d256e81a6ed720257ad
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 0.9832

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/free-robux-games-2021-game-hack.
  • 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/free-robux-games-2021-game-hack PDF link annotation
    • https://inspiration-modellbau.de/images/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/get-more-robux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/robuxmaniac-com-free-robux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-to-get-free-robux-indieun_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-advertisement-bot_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/veichle-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-roblox-intros_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/hacking-laurenzside-roblox_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/free-hack-tool-robux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://inspiration-modellbau.de/images/rbl-gg-free-robux_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
stream_004_off00004f0a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F0A 31028 bytes
SHA-256: fd231b5d0cb7bf5bcc2a2073c2655df2651be8a25a48bc5a5d9b544c3eb5ec1f
font_01_sfnt_off0000912e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x912E 18904 bytes
SHA-256: 2e961b4bca5e43f270445f2bf42c8e4bbd89347d9862a645ef2e74e5c29e3187

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