Malicious PDF — malware analysis report

Static analysis result for SHA-256 af53f1c24b3b8ace…

MALICIOUS

PDF

46.6 KB Created: 2021-06-09 13:46:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d534a30605291c7f9ff8cd5b4cedf52d SHA-1: dbcc3a0776b3f6af1c2794683590f523f5de0bdd SHA-256: af53f1c24b3b8ace6fe185c281d1fe2bb4dfa39bb5a026cd381ce1135d7d7c28
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 0.9748

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.tw/app/431946152/free-robux-sites-that-work-2021-game-hack PDF link annotation
    • http://pustaka.fateta.unand.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/how-to-add-free-robux-to-your-account_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/roblox-re_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-tiktok-followers-2021_GM835599320.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/how-to-get-2021-robux-for-free-proof_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/pokemon-go-free-box-march-2021_GM1094591345.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/get-free-item-in-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-roblox-hack-inspect-copy-and-paste_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://pustaka.fateta.unand.ac.id/repository/coin-master-free-spins-link-download-free_GM406889139.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
font_00_sfnt_off00004ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EC8 24160 bytes
SHA-256: 81c3c84374ffa45a673773c2daccd057b7dfbd8ba8e02c3afabcde6208613d22
font_01_sfnt_off00008595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8595 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA5 19404 bytes
SHA-256: fa502557e4e4e3ca94c015a80f8b28ee2b2c7c0bf190c2971da37432ca3ad06b

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