Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b674b9d8fd1773…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 12:13:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 421a1e4be978fdd43431349d6bec553a SHA-1: 49a07919b7c337c287ed34350e73eb4b1c9de761 SHA-256: c9b674b9d8fd1773a2a653b12beef0d86def0c253b03e1c1fae144a94c10c4b2
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, which is designed to lure users into downloading potentially unwanted or malicious content related to game hacks and free currency. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely using a spearphishing attachment as the initial vector. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-daily-free-spins-game-hack In PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/gana-500m-de-robux-con-este-hack-2021-100-real_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/roblox-hacks-and-cheats-for-mac-2021_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/roblox-jailbreak-hack-noclip-zip-file_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/roblox-hack-scrit-2021_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/abd-roblox_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/break-free-song-id-roblox_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://stptonline.badungkab.go.id/assets/CKImages/files/daily-free-spins-coin-master-2021_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_002_off00003292.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3292 23292 bytes
SHA-256: 2e83864b7ac4549aac6326032716d044e7b73be53cbc769d8a485255a64634e3
font_01_sfnt_off000066e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E8 18596 bytes
SHA-256: d4477381221bf12ecca5ad3e1f3dc1fc74afabeab8ec0ad27ac375f28b3d2402

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