Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a10a715f9a4e71…

MALICIOUS

PDF

34.1 KB Created: 2021-07-09 08:28:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ddd714d5ee81be83fa5553c8a9b0e70b SHA-1: 4a2f5260dfd35beb90c7ef36b2087a0696949d53 SHA-256: c8a10a715f9a4e714945d9996da0465fe7c9d0bf4a25161f3ba31830148f337c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, using keywords related to game hacks and free currency to attract victims. It contains numerous links to external PDFs and redirectors, indicating a phishing or scam campaign. The document body and heuristics confirm the malicious intent to redirect users to potentially harmful sites.

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/406889139/coin-master-hack-2021-link-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/minecraft-education-free_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-audio-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/lox-hacks-for-robuxe_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/robux-hack-pro_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/http-proxy-site-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/wiki-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-just-type-in-your-username_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-roblox-hack-executor_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/one-player-game-free-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-hack-download-no-survey-no-verification_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-cheat-engine-bypass-november-2021_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_off00002f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F29 22720 bytes
SHA-256: 05aeff796a784e1b1a1db4231aa67c7d6ba925261dc6bf858e562051bf72362f
font_01_sfnt_off000061d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D2 18408 bytes
SHA-256: 8438728008f6ab05b5c9a65d4eeb1f2e5c23a436eadc11c6e76328f72b7d7fb7

Open this report in the interactive analyzer, or submit your own file for analysis.