Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59b8940558493a5…

MALICIOUS

PDF

42.6 KB Created: 2021-05-11 12:38:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8f2a67a2a77503f037d577bc4223c9b0 SHA-1: aea858ef616b5caefed81ad121f0e257442db803 SHA-256: b59b8940558493a52b2fff9f6075a2a8fcf19a0d40cd1148c5622f4922451e8f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector, specifically advertising a 'Coin Master' game hack. The document body and heuristics indicate a lure for free game currency or hacks, designed to trick users into visiting the malicious URL. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-download-game-hack In PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/coin-master-rare-cards-hack_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/coin-master-free-box_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/daily-spin_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/coin-master-spin-rewards_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/20210-free-spin-links-for-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_003_off00004882.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4882 24904 bytes
SHA-256: 9f5421ee24a848630282c78a211dcd028f226674676f72080b5289fa099f0357
font_01_sfnt_off000081a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A5 19044 bytes
SHA-256: dca9c54eb7909a3e4534a76f76ee6189f96b2efc2326d8de9d8399176ddaf84c

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