Malicious PDF — malware analysis report

Static analysis result for SHA-256 386f39b51a2fe417…

MALICIOUS

PDF

42.5 KB Created: 2021-06-03 09:13:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 85f423f18adf6ac4c721ecfbffb85c3a SHA-1: 4c4a332192e88f90affa01a9442b0726fd7583ab SHA-256: 386f39b51a2fe417ddd28be7ceedc93f95bf650265b575d13786d089c8957b78
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting game hacks and generators. The heuristic firings indicate that this PDF is designed as a lure to redirect users to potentially harmful content. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification suggest a malicious intent to drive traffic to exploit or scam pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/1330123889/pubg-uc-30-game-hack In PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/pokemon-go-free-incubators_GM1094591345.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/pubg-700-uc_GM1330123889.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_off00004b24.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B24 24584 bytes
SHA-256: 5f7b3268261164433ceba4448db11d1ab24b52f68591e06f90330a2fe584e3d3
font_01_sfnt_off000083a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A3 18244 bytes
SHA-256: 741471ec9c50101b8bad3c1963c6210fd5e3b39661ce1fad8ec1fd8cebef5b02

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