Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ccb26ac803d3ad…

MALICIOUS

PDF

42.5 KB Created: 2021-05-12 12:43:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 431e7c0819125f11d4b1609748333798 SHA-1: 9442ae7c5d19a009fb505dbdc0ee1651c9aaeef0 SHA-256: 64ccb26ac803d3ad82af14294391faaf36a7e48125510c32b61716ec8777b3bc
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that lead to a known malicious redirector, disguised as offers for game hacks and generators. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous suspicious URLs reinforces this assessment. While no scripts were explicitly extracted, the nature of the links suggests a potential for further malicious activity, such as downloading a second-stage payload.

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/479516143/best-free-hacked-client-game-hack In PDF document text
    • http://ptts.pl/images/gain-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://ptts.pl/images/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/collect-free-spin-linms-coin-master_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://ptts.pl/images/wurst-client-download_GM479516143.pdfIn PDF document text
    • http://ptts.pl/images/coin-master-cracked-apk-free-download_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_off00004a50.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A50 25360 bytes
SHA-256: d63a01e54ee7e240727c0a55b6acc4e92340f8266344057c09aacffa645b33e6
font_01_sfnt_off00008419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8419 18200 bytes
SHA-256: f9e1919cba188461631b4d1f41fa639bbd05523e10553c39d41e2ec7b66d941b

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