Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9121e1ae589098a…

MALICIOUS

PDF

45.5 KB Created: 2021-05-18 01:23:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0d879f99d75f2cb78aa4dbf87ca2083c SHA-1: 67c694efa6e11d64c41b0b1c726a59c7e7513904 SHA-256: e9121e1ae589098a3295249b4d7bbf608cbf4fe045835e010b393568dc43dcb6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure impersonating Facebook to trick users into clicking a link for 'Robux Rewards', which is a common tactic for credential phishing or malware distribution. The primary malicious URL identified is https://netcdn.xyz/app/431946152/robux-rewards-game-hack. The document also displays a fake CAPTCHA, further reinforcing the deceptive nature of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 6

  • 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
  • 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/robux-rewards-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/robux-rewards-game-hack PDF link annotation
    • http://unsere-beagles.de/images/10-robux_GM431946152.pdfIn PDF document text
    • http://unsere-beagles.de/images/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • http://unsere-beagles.de/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://unsere-beagles.de/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://unsere-beagles.de/images/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • http://unsere-beagles.de/images/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • http://unsere-beagles.de/images/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://unsere-beagles.de/images/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://unsere-beagles.de/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://unsere-beagles.de/images/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
    • http://unsere-beagles.de/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://unsere-beagles.de/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://unsere-beagles.de/images/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://unsere-beagles.de/images/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://unsere-beagles.de/images/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://unsere-beagles.de/images/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://unsere-beagles.de/images/wurst_GM479516143.pdfIn PDF document text
    • http://unsere-beagles.de/images/coin-and-spin_GM406889139.pdfIn PDF document text
    • http://unsere-beagles.de/images/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://unsere-beagles.de/images/prison-life-roblox-hacks_GM431946152.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_off00004760.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4760 25176 bytes
SHA-256: 656a47706e9f48e2fbd3c6a106ceeb085e61771488ac98db9e6b7ae3de5d2aef
font_01_sfnt_off0000819a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x819A 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00008eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAC 18416 bytes
SHA-256: baa52bc2b9097a09398c96fb3294e1a8f27ad59dda05ce480693cb4701b7841d

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