Malicious PDF — malware analysis report

Static analysis result for SHA-256 d389300b5755745e…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 09:43:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 72f417b9dabb63423fdf539548f6273e SHA-1: 64100683837568622737dadc2c24aea4044033df SHA-256: d389300b5755745ea063ffb571a07bed9bc7693fcfa54471d8a4ad14a77c083a
142 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. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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 http://netcdn.tw/app/431946152/blox-fun-info-game-hack PDF link annotation
    • http://lib.stie-aub.ac.id/repository/roblox-android-hack-apk_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-make-the-animation-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-change-money-in-roblox-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/can-i-have-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/descargar-roblox-hackeado-adopt-me-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-paste_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/calamari-roblox-free-acounts_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/how-to-get-free-robux-on-roblox-pc-2021_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/roblox-supreme-hoodie-free_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-robux-developer-tools_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/free-roblox-logo_GM431946152.pdfIn PDF document text
    • http://lib.stie-aub.ac.id/repository/best-free-girls-roblox-outfits_GM431946152.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
font_00_sfnt_off00002e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E0F 22092 bytes
SHA-256: 67c38f96250df9c1c38c8ca124c0c6a0f88c3411fb1c96080f45249639a19cdd
font_01_sfnt_off00005f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F22 18632 bytes
SHA-256: 911c732773a7a1004863e03d2f69206fb35b0346a9dd04ad6343209aabb63a44

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