Malicious PDF — malware analysis report

Static analysis result for SHA-256 31157825480df813…

MALICIOUS

PDF

42.6 KB Created: 2021-05-11 02:08:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 95534327542a10f865e426d3988c7946 SHA-1: e168c0770503ef2c820179658f4d25f8d666fe98 SHA-256: 31157825480df81342220471a66c14f8f96b5a0441774f893ff37f49d7e34137
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 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-link-today-instagram-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a44.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A44 24408 bytes
SHA-256: ad75a302f2e47f0b99651e9ca3d000eda8e6c8368a2bc517d96091d349277f4b
font_01_sfnt_off00008239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8239 18960 bytes
SHA-256: c3cae131f36bdfe9c813bd150295f39ca0ceeabf3546a2df254cc03f93d9c6e3

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