Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdf1afc50aa9aee…

MALICIOUS

PDF

43.0 KB Created: 2021-06-04 01:10:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 473eccca5bf781f9ec7df93ff79acd5c SHA-1: 21a80e8208a845482c334d655158a2748216c0f0 SHA-256: efdf1afc50aa9aee92ff9302b2b035c85ec9a3117e1acda94c933941f5c1b061
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector infrastructure, specifically promoting "game hacks" and "free generators". The ML classifier also flagged this PDF as malicious. The primary malicious URL identified is https://netcdn.online/app/406889139/coin-master-spin-hack-no-verification-game-hack, which is likely used to deliver a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/coin-master-spin-hack-no-verification-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/pokemon-go-hack-free-pokecoins_GM1094591345.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/tiktok-free-download-2021_GM835599320.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/is-tiktok-free-on-apple-store_GM835599320.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-com_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-gameplay_GM406889139.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_004_off00004efb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EFB 24076 bytes
SHA-256: 6139e94f8a7266d7f6852072cc4196c6e6a5a7ae1dcf5198b32004f395fbca51
font_01_sfnt_off000085de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85DE 18028 bytes
SHA-256: 2de0e9c41ce50443ccbc7b49ff620d9d14c87888ef748e70805f38b18b312090

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