Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef7df85d6a41aab…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 12:53:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0314cf93345a1e684b161d9604f859bb SHA-1: 1f77b024536a9f53e4d887551f2d9b9f2357fe2a SHA-256: 9ef7df85d6a41aabe74d823fd02f0858ff1f909d56c554ea3a1cefd1d5e2c0d1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, under the guise of providing free game items and spins. The document body and embedded URLs suggest a phishing or scam attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector chain, likely leading to further malware or phishing content.

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/daily-free-spins-coin-master-2021-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/master-hack-coin_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hacks-for-pet-food_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-daily_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-cheats_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spin-link-coin-master-app_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_off0000511e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x511E 24048 bytes
SHA-256: 5fbcbe49b9524a917fc15b21d34f106ddcb26428dd214107f58d65efbe40f06a
font_01_sfnt_off000087dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87DD 18708 bytes
SHA-256: 76af36f54327e394f6a0995f5c1804c6d580e71cb7eebf938ec25838add40309

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