Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f686f171e915f1…

MALICIOUS

PDF

47.0 KB Created: 2021-06-04 00:07:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2fbd83bcd3415156cb260a2c0cda6fe6 SHA-1: dad75c20891faa8ba1417f01a6b5fb24e820dee2 SHA-256: 97f686f171e915f15efba83e4a1e1145333be63a52c8d877fc2d062c5a802a95
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors and lures users with a fake CAPTCHA or human verification prompt, likely to trick them into downloading further malware. The embedded URLs suggest a phishing campaign related to game-related cheats or currency. No scripts were extracted, but the presence of malicious links and the fake CAPTCHA lure strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-robux-youtube-game-hack In PDF document text
    • http://lib3tell.stptrisakti.net/repository/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-tiktok-views_GM835599320.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/howwwwwwwwwwww-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-hack-https-coinms-net_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_off00005246.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5246 29668 bytes
SHA-256: aef161f9fba89705bf220455b96c8b17766a442a5346c9f2484910da191f69cf
font_01_sfnt_off0000954e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x954E 18280 bytes
SHA-256: de5b074060e7ee0fa0230ac6212805924cd4a5679e09505111534b28358c176b

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