Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a92d8dbaadb4084…

MALICIOUS

PDF

34.6 KB Created: 2021-06-20 13:21:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 620799c58b32d9f0a9f0c5ce2c15cafa SHA-1: 2ae80bd43ea09501545510c8954de71d11e29b09 SHA-256: 0a92d8dbaadb4084fb3ae9bfb4464023ac5019b82596a67c9f67218d6f4cd4f1
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/free-promo-codes-2021-roblox-game-hack. The document body and heuristics indicate a lure for game hacks and promo codes, a common tactic for distributing malware or conducting phishing. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.co/app/431946152/free-promo-codes-2021-roblox-game-hack In PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-eclipsis-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/get-free-cloths-off-of-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/mcpe-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/can-u-make-a-shirt-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/oprewards-login_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://pustaka.pn-calang.go.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.pustaka.pn-calang.go.id/repository/get-free-coins-for-coin-master_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
font_00_sfnt_off00002e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E55 22428 bytes
SHA-256: 785e37b7f0856a71c025d1891ee15d043f8dbbc577306e7107ec9a5bbddc6312
font_01_sfnt_off00006042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6042 19640 bytes
SHA-256: b6834c20749a95d853b9e82be7a93de4156b5cba5893b1891c3bd8fb5e597b16

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