Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c73276d9a079e1…

MALICIOUS

PDF

33.9 KB Created: 2021-06-27 15:47:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: dff25d72ded1fbb3dcedcfbaec408039 SHA-1: 4f4cc24f4e5b0f2af0d373cf31735dfd0b96eb53 SHA-256: b9c73276d9a079e1476b74ed44bd65f71d78f407e988d1fd8b7725c19737601b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary redirector URL is http://netcdn.co/app/431946152/free-robux-cosed-game-hack. This pattern is indicative of a phishing or scam campaign designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of numerous embedded URLs and the 'GAME_HACK_REDIRECT_LURE' heuristic strongly suggest a social engineering attack.

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-robux-cosed-game-hack In PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-shirts-on-roblox-for-free-no-bc_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/wurst-112_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-cheat-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-by-completing-offers_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/minecraft-handbook_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-and-tix-generator-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/show-me-a-picture-of-a-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-robux-obby-easy_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-bloxburg-free-money-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/minecraft-launcher-download-free_GM479516143.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_off00002e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E70 22260 bytes
SHA-256: 9970b5af8ec77674f48d014d1db9652c8a49393ff0aee7521748e832d89a479c
font_01_sfnt_off00005ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF0 18888 bytes
SHA-256: 764c8739c4c17a5772089f187f90463106b767e2bd4446bdefa05f9d89c79bb9

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