Malicious PDF — malware analysis report

Static analysis result for SHA-256 c922a71469cba701…

MALICIOUS

PDF

33.1 KB Created: 2021-07-09 19:04:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9e8df2c94b5b5682a99cdf60d014f880 SHA-1: b45b6ea65311005dba4acc927e3cb09f01bb0fac SHA-256: c922a71469cba7019581641860f460f84ebe41f41fec74a04ad9d558377f4f7a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, masquerading as game hacks and free item generators. The primary lure directs users to 'http://netcdn.tw/app/431946152/games-to-get-free-robux-game-hack', which is flagged as a malicious redirector. The document body also contains a call-to-action to access a 'ROBUX GENERATOR', further reinforcing the phishing attempt. No scripts were extracted, but the embedded URLs and the nature of the lure strongly indicate a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.tw/app/431946152/games-to-get-free-robux-game-hack In PDF document text
    • http://thamelinn.com/userfiles/files/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-back-a-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/saber-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/rbx-earn_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-win-robux_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_off00002a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A11 22948 bytes
SHA-256: ce966fbb3976fd9894b88bfb5233e6eb1912ca01d94d0693a278716e9eca80ac
font_01_sfnt_off00005c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C73 19080 bytes
SHA-256: 03ba3cd79afa517eed98ce6a768f8c6318a94a6bbf9eb4faa980b5a438220dad

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