Malicious PDF — malware analysis report

Static analysis result for SHA-256 a347aaeb33a88c5e…

MALICIOUS

PDF

49.6 KB Created: 2021-06-03 22:03:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7c38d6430b04bbc0522ac0a452d281c2 SHA-1: 2cbb58377d66157248c76fe294cd0388aebe650c SHA-256: a347aaeb33a88c5eb64ebce20d5ab7487dd25a2198e0a10e56524341ddc0ac93
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains multiple links to external websites, including a known malicious redirector, under the guise of game hacks and free generators. The presence of a fake CAPTCHA heuristic indicates an attempt to trick users into interacting with these links, likely leading to further malicious content or scams. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/prison-break-hack-script-roblox-game-hack In PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-change-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/pokemon-go-free-vpn-android_GM1094591345.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-spins-android_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_off00005647.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5647 31484 bytes
SHA-256: 07f62507f349a493e2a9bef86c44369e6f6beaaa8fc1daa3e472b3c033479115
font_01_sfnt_off00009e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E60 18736 bytes
SHA-256: 4de41c8831638c928701d2f824d0f7fc87b15dc2c85863c6f0433eca1ff44a46

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