Malicious PDF — malware analysis report

Static analysis result for SHA-256 942d5dcc00362af8…

MALICIOUS

PDF

54.3 KB Created: 2021-06-03 11:08:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f52e85b29ed3ee4255e01f13ff03d111 SHA-1: 243359c2372c30a5629f25773539adceeeff7cc4 SHA-256: 942d5dcc00362af8a3f3cff7a4a63c0d87c912af0115b8bd21da35701427f5da
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 0.9636

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/instant-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.online/app/431946152/instant-robux-game-hack PDF link annotation
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-do-you-hack-roblox_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_off0000574f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x574F 26592 bytes
SHA-256: debe4afd5f02fa627f8e1218b822880911552972b858372eff72bc75afb7f8f0
font_01_sfnt_off000095f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95F4 8992 bytes
SHA-256: 80e538540c2c1d28aada38391ff0bc62cb0261d6d819d9ce0cd7fc2076729c32
font_02_sfnt_off0000b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB249 18184 bytes
SHA-256: 234f9e95fa1241feb438ae0efba81c56d05ba2863eb0b0d090bdd6eb60e49a51

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