Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f9015c577286ab…

MALICIOUS

PDF

45.0 KB Created: 2021-05-19 20:37:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a14449280f40c74c9a0843f00bf18e80 SHA-1: a97d0be18b23faf6fb10390edf182e9d2aba8a18 SHA-256: c1f9015c577286ab9abedd3b19ee3bd4148c1c2e8624fd15aca31a77788da1f6
122 Risk Score

Malware Insights

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

The PDF contains a lure for game hacks, specifically mentioning 'Free Robux', and impersonates the Amazon brand to trick users into clicking a malicious link. The link redirects to `https://netcdn.xyz/app/431946152/how-to-actually-get-free-robux-game-hack`, which is likely a phishing page or a downloader for further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/431946152/how-to-actually-get-free-robux-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.xyz/app/431946152/how-to-actually-get-free-robux-game-hack PDF link annotation
    • http://1a-vermietung.com/images/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://1a-vermietung.com/images/how-to-get-free-spins-on-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • http://1a-vermietung.com/images/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://1a-vermietung.com/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/get-robux-com_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://1a-vermietung.com/images/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://1a-vermietung.com/images/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • http://1a-vermietung.com/images/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a24.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A24 24748 bytes
SHA-256: 9a8e00bde61369de7802622868a3eeeb595d6f2dc2d5ee04323bf311e82da03d
font_01_sfnt_off00008184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8184 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B93 18764 bytes
SHA-256: 380379838da7ba69723634981f8e24f026256aff947d3d13a6d99450b2ab0cc3

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