Malicious PDF — malware analysis report

Static analysis result for SHA-256 8156d31e86989986…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 12:21:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0a169ea217dc7d567e3ec04d3a7a8bce SHA-1: 907783f5634f7ee2d9269901a411fc25ec61d880 SHA-256: 8156d31e86989986b558b4a9629f295b15261b04bbb0c2d2fb9336f43077a535
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 0.9865

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.online/app/431946152/freerobuxhack-us-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.online/app/431946152/freerobuxhack-us-game-hack PDF link annotation
    • https://www.insol-europe.org/uploads/files/files/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/buy-tiktok-likes-free_GM835599320.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-hack-facebook_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/offers-for-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-free-spins-daily-link-game-mod_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/roblox-but_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/free-robux-android_GM431946152.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.insol-europe.org/uploads/files/files/codes-to-get-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_off0000525c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525C 25048 bytes
SHA-256: b91f7c8d8e6253e14fb1674d7bfda84508ec4236c5b39c7ee21086a5b836163f
font_01_sfnt_off00008c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C9F 18764 bytes
SHA-256: eb8464b7a0addd56b603953feb3e29196181109f3d6ed00b0f5bffeafad9fb96

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