Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf07424cad6560f4…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 15:43:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8e3542a5fc763e607a30572ae108dddb SHA-1: 989f574b3c30120e79e429f56f2ba8a07799e744 SHA-256: cf07424cad6560f46e9581cf15cca1c089f0c5f064ecf97fe13d1f1649a76cd2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one identified as a malicious redirector. The primary lure, 'coin-master-free-link-today-game-hack', redirects to 'http://netcdn.tw/app/406889139/coin-master-free-link-today-game-hack', which is associated with malicious activity. The presence of a visual download button further supports the deceptive nature of the document. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users into visiting malicious sites, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-free-link-today-game-hack In PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/murder-mystery-2-roblox-cheats-free-elite-and-radio_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/tiktok-free-website_GM835599320.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/create-own-free-skin-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/attack-on-titan-downfall-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-free-redeem_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-robux-hack-rar_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/hack-robux-cheat-engine-61_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-make-any-purchase-in-roblox-free-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/spped-hack-2021-october-for-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/games-on-roblox-that-give-you-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/easy-robux-hack_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-hack-and-become-higher-rank-roblox-d-day_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-hack-peoples-robux-in-roblox_GM431946152.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_002_off000031b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B6 23120 bytes
SHA-256: 12ff7198c8c651ae0bba3d911f9015974c8f52e9bc0f273f3ef71b64577a9e5c
font_01_sfnt_off000065a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A9 18524 bytes
SHA-256: a920f55f025afea5015e120a5f5dfdf37c8d5d267cdc7def099919dbf31b76fa

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