Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4007e57d2faf06…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 10:03:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9a4c8847c498bf9e9b49c278c7d6841a SHA-1: 6aeb8593b1dc1934af19f57ca0614c25f8646379 SHA-256: de4007e57d2faf0609ef09adbc6474259302ebc999b1f1ce901d05167f48b7eb
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to redirect users to external websites, many of which are part of a link farm for game hacks and free currency. The primary redirector URL is associated with malicious activity, and the document body itself contains a call-to-action lure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/406889139/2021-free-spins-coin-master-link-game-hack In PDF document text
    • https://miraller.com/upload/files/play-coin-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-get-free-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://miraller.com/upload/files/free-disney-plus-accounts-tiktok_GM835599320.pdfIn PDF document text
    • https://miraller.com/upload/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://miraller.com/upload/files/coin-master-free-coins-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_004_off000053d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D6 26436 bytes
SHA-256: 6985267e578a760f29216b295ce2a7dce37d75d506cac50aa403b3cec6b2c9d7
font_01_sfnt_off00008f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F14 18456 bytes
SHA-256: a76936ec484ac031b8c5f7bd82bd0b34adbabb4d9e9d5cccdc9978d26973b99a

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