Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb95f05b237de70…

MALICIOUS

PDF

50.3 KB Created: 2021-06-10 16:31:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 546f346eef9ece23fb8482c7881d6d7e SHA-1: 0ab7449e6811e0652d04ce8b3ce4af0525877ea7 SHA-256: acb95f05b237de708db9fb830552c3131c1d39818dd2055e5027abdb95334d44
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 0.9769

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.
  • 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/roblox-hack-no-survey-2021-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.tw/app/431946152/roblox-hack-no-survey-2021-robux-game-hack PDF link annotation
    • http://vedrachemicals.ro/images/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://vedrachemicals.ro/images/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://vedrachemicals.ro/images/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://vedrachemicals.ro/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://vedrachemicals.ro/images/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://vedrachemicals.ro/images/cashrapps-free-roblox_GM431946152.pdfIn PDF document text
    • http://vedrachemicals.ro/images/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://vedrachemicals.ro/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://vedrachemicals.ro/images/roblox-free-dowlod_GM431946152.pdfIn PDF document text
    • http://vedrachemicals.ro/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://vedrachemicals.ro/images/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://vedrachemicals.ro/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://vedrachemicals.ro/images/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://vedrachemicals.ro/images/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://vedrachemicals.ro/images/coin-master-level-4_GM406889139.pdfIn PDF document text
    • http://vedrachemicals.ro/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://vedrachemicals.ro/images/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://vedrachemicals.ro/images/coin-master-how-to-get-japan-sushi-card-free_GM406889139.pdfIn PDF document text
    • http://vedrachemicals.ro/images/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://vedrachemicals.ro/images/blox-land-free-robux_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_004_off000051ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51EC 28700 bytes
SHA-256: 481aa240ade6b4737f02e8235a38a22f72effc7ab89e8fa097cf662396b99911
font_01_sfnt_off00009577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9577 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00009f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F87 19020 bytes
SHA-256: 1b196d99a0e5ba5fdbb4d4bcf4acc3505a9e677e39dcb79ba79de5d9b2b17bfc

Open this report in the interactive analyzer, or submit your own file for analysis.