Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef087a018cc49e5a…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 14:32:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3759f525259ee35ab22a13ab1655184e SHA-1: f4dde0c1122aad9ffd06914a9cc7278f166036ee SHA-256: ef087a018cc49e5a368c424d3ee94800e19baf57ca92541e0554188a25deb63b
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/479516143/minecraft-free-version-pc-game-hack PDF link annotation
    • http://librarysenior.com//repository/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/wurst-115_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-minecraft-for-free-on-xbox_GM479516143.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_off0000537b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x537B 24828 bytes
SHA-256: 94c6d8f05345016b8c29be59328e2120927297d8c9c0eaa31a301be557c5e014
font_01_sfnt_off00008c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6A 18000 bytes
SHA-256: 596bbbc5b74f8f8d5f8cfb941eefd0324f2b497cb668fe7d549b39bc00e1e0cd

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