Malicious PDF — malware analysis report

Static analysis result for SHA-256 65bf6558fffdf35d…

MALICIOUS

PDF

36.3 KB Created: 2021-06-30 11:32:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ce19a03e5b0936bacd67197f001f386f SHA-1: 8101f88ec798df245b0506ada2ef2e7786d8f632 SHA-256: 65bf6558fffdf35dde98ecae44cf5db8bbb5a1913f0d2862fd96fc5f76390cf9
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.co/app/431946152/free-robux-legal-2021-game-hack PDF link annotation
    • http://library.unissula.ac.id/fk/repository/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-rs-cheat-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-admin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/pokemon-go-free-versus-pc_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-paid-roblox-games-for-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/static-moonactive_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/acop-roblox-hack_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
stream_002_off00003382.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3382 23392 bytes
SHA-256: 765ededa2f02940b83cd8e352fea6a0c2667ff5d1e75cd1a50437febaa65c7f1
font_01_sfnt_off00006865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6865 19192 bytes
SHA-256: 2fafe787577aea4eb5cad19cc2a07bfa53d17a43826e22792ae9d449791faa8c

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