Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b8e9e1bed068a4…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 07:09:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0702112f9a464693531a09033b78ebf4 SHA-1: aa372a12e8b4fad5c5d540346e3c878eb26561c3 SHA-256: 54b8e9e1bed068a4c1dbf196f94cf1ef46cc478ec0d587d7c649862a49a31fb3
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one identified as a malicious redirector, which is likely intended to lead users to scam or malware-hosting pages. The document body and heuristics indicate a lure related to game hacks and free currency, suggesting a phishing or scam attempt. The presence of a large number of linked PDFs points towards a link farm or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-do-i-get-free-spins-in-coin-master-game-hack In PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-hack-co_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/roblox-account-taker_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://culture.denpasarkota.go.id/assets/CKImages/files/free-magical-chest-coin-master_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_off00005241.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5241 25116 bytes
SHA-256: 49aa98033c3df9ce4daa68b6a42914851844637de75aedcb4adfe2eaf8c00c22
font_01_sfnt_off00008a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A96 18216 bytes
SHA-256: b027c2a021bab7014740c7b31d1151edd7292f7703eb7b510e8af7521ebdade3

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