Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7301d7ed9bd524…

MALICIOUS

PDF

34.8 KB Created: 2021-07-06 02:02:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9070d5057f80c704ff38ec8e4d0c3472 SHA-1: e7369987cc2e31312e7a4d30c113d89c1c6ceea8 SHA-256: 8c7301d7ed9bd524ca37f76e58f7d70d3a4960f4c209096f7365db35d1cf0bc8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users to a redirector hosting game hack content. The primary malicious link, http://netcdn.tw/app/406889139/coin-master-hack-program-game-hack, is flagged as malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-hack-program-game-hack In PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/100-robux_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-guess-the-character-cheats_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/greenwood-roblox-como-consegir-free-vip_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-into-someones-account-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-fr-pc_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-flower-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-do-i-get-free-robux-without-scams-and-ads_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-free-online-without-sign-in_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hacked-roblox-logo_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-troll-players-script-hack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/best-roblox-hack-website_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-for-roblox-cheats-and-guide-download_GM431946152.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_off000032d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D7 22544 bytes
SHA-256: 34e32e158f533bbf7c47ebaf8e1b3d0c0f8974a659204264ebd6331777ecbb7f
font_01_sfnt_off00006513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6513 18416 bytes
SHA-256: 5741a127261724fddf521fc94ebfc06f31583a26a9f94a4c147a021759ab8b48

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