Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a91caae4811ef5…

MALICIOUS

PDF

38.7 KB Created: 2021-07-05 00:05:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a1a3fbdfce180798c861a51c431a178a SHA-1: a2e2cc7c716aa6cf71b128ca1017f205860aaa9f SHA-256: a9a91caae4811ef525b2f8a47ed5fec69012e25636143f055ff7bc507035c881
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically advertising a "game hack" or "generator". The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the PDF structure and embedded links strongly suggest a social engineering lure to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/406889139/coin-master-gameplay-game-hack In PDF document text
    • https://www.repository.ptiq.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/new-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/free-robux-hack-2021-inspect_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/earn-robux-now_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/how-to-get-a-hacker-out-of-your-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/comment-etre-un-hacker-sur-roblox-francais_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/simple-game-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/cheat-ultimate-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/cheat-codes-roblox-hero-academy-tempest_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/free-robux-no-verification-hack_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/how-to-get-free-daiblo-in-ultimate-drive-roblox_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/roblox-free-terminated-accounts-passwords-and-logins_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/village-4-coin-master_GM406889139.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • https://www.repository.ptiq.ac.id/repository/roblox-hack-models_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

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_002_off00003d1e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D1E 24336 bytes
SHA-256: fad3b1b76bc84904642b3aba9a2ab8c64914555d7628efc60b4c2164eef491a3
font_01_sfnt_off0000741b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x741B 18524 bytes
SHA-256: 16b9cb38bcb2a142b34ef46ce62b1942e172e3ddddc78505f18b000df75c2c6a

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