Malicious PDF — malware analysis report

Static analysis result for SHA-256 0448f322eb1ab0be…

MALICIOUS

PDF

50.3 KB Created: 2021-06-03 10:40:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fb3d153e719b9d9a1c56d9ac608f6d9e SHA-1: 55523816392b63f382fad48ea4c5043580bb6fd0 SHA-256: 0448f322eb1ab0be6e404b3326b4cb599b04261d2a9aa93e249fbae304b64de4
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or game hacks. The document body and heuristics indicate a lure designed to trick users into visiting these malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.online/app/431946152/how-to-get-robux-for-free-2021-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hack-tool-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-but_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-a-game_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005059.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5059 29188 bytes
SHA-256: eb90e2aca2012c5b5c90e90615d581605ef789df1b3f21abd459954199c6c6ae
font_01_sfnt_off0000940b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x940B 3884 bytes
SHA-256: 64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29
font_02_sfnt_off0000a0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0B3 18684 bytes
SHA-256: 65f445f0396e54760dd2a1edc1744209422bc48f29c35ea74a9bcb72e79f8b06

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