Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cd14d55a01848e…

MALICIOUS

PDF

37.2 KB Created: 2021-07-05 09:30:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b2a77d4a9f1eea43391a89f97c2a410c SHA-1: 37dd1f72f7bf2987be995491f3d0e48625220093 SHA-256: 40cd14d55a01848ef0aad49fa37c55e9ca14ad2aee6e315a980cb0cb116340d2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to appear as generators or hacks for popular games like Roblox and Coin Master. These links redirect to malicious infrastructure, specifically a URL associated with a 'free robux' generator. The document body and heuristics indicate a lure for potentially unwanted or malicious content, likely serving as a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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.tw/app/431946152/free-robux-no-verification-or-survey-2021-game-hack In PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/roblox-how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-promo-codes-roblox-may-2021_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/how-to-hack-roblox-games-no-downloads-2021_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/gucci-logo-roblox-free_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/roblox-how-to-upload-audio-for-free_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-robux-come_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/roblox-superhero-tycoon-free-money-command_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://tapinkab.go.id/assets/CKImages/files/earn-free-robux-for-roblox_GM431946152.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_off000036b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36B7 22884 bytes
SHA-256: 76bb4f5f41ce5d455aa9b2dab2fde4cafac5ce97c343df4df08a5b37fec69ac0
font_01_sfnt_off00006a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A14 19772 bytes
SHA-256: a441bd845f25f30d9b35deb0a49928c69a030f2d5bccbb8c502819d18c42e29e

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