Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a9284fbad2940a…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 12:06:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 730bd3e54cf8cc5ebcd3e9a7ea333faf SHA-1: 0c16fda621e27dde2099406400251a7155a03c36 SHA-256: 81a9284fbad2940a18cd67290489c430c3aa0e2e537ec72b76f4083b4d4bf29b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as malicious infrastructure, promoting game hacks and free currency. The document body and embedded URLs suggest a lure for users seeking in-game advantages, which is a common social engineering tactic. While no scripts were explicitly extracted, the presence of multiple malicious redirector links indicates a high likelihood of leading users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/facebook-coin-master-game-hack In PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/youtube-free-fire-tik-tok_GM835599320.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/spin-and-coin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/coin-master-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/pokemon-go-free-download-for-pc_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/www-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.fk.unila.ac.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.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_004_off0000536d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x536D 25404 bytes
SHA-256: d7f235d7314fb105f82e65fea729b50be64bd2f8ee62fb92b57fe4f99a7185c2
font_01_sfnt_off00008c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2A 18040 bytes
SHA-256: 178fba5589456397b3db1a2238140a14569a80f5ff3c7f1b6d6dfbcfd3cbde63

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