Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8a139c4b46fecb…

MALICIOUS

PDF

43.1 KB Created: 2021-05-11 22:04:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 5291fe92595d59a92952ed1ccaf6e9e7 SHA-1: 69eb073f845b770bc2000b15c5672a14c6f5d4e2 SHA-256: ff8a139c4b46fecbfde0c20de41b414d8ef6bb530ee652559646e29d51e2fb37
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links that redirect to malicious infrastructure, specifically promoting game hacks and free in-game currency. The ML classifier strongly indicated maliciousness, and the document body contains text and URLs consistent with a phishing or scam lure. No scripts were extracted, but the embedded links are the primary mechanism for delivering the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-download-hack-ios-game-hack In PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/game-give-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/spin-rewards-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/free-coin-master-s_GM406889139.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/roblox-com-robux_GM431946152.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/coin-and-spin_GM406889139.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/mistplay-robux_GM431946152.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://e-learningmin19jkt.com/__statics/gudangsoal/files/master-coin-free_GM406889139.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_003_off00004a05.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A05 25928 bytes
SHA-256: d8960582a6594cf9836e0e83e7f7f8a48791f06057ad152233236b9ae8f3d2d2
font_01_sfnt_off0000861b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x861B 18296 bytes
SHA-256: 1cb6a319f6d9569ab7722fb52682a7a8db362276ea2047cd2a373f417cbf3e42

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