Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85a66d0655e2133…

MALICIOUS

PDF

44.8 KB Created: 2021-05-16 02:27:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 769b661243743cc24b1ba72a80a46992 SHA-1: e0d0fe7789b9259d540669b9608b55f68b070acb SHA-256: f85a66d0655e2133a5fa872531819ec41b31e43614aa284d182ca0ab681e26f2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple links to known malicious redirectors, specifically targeting users with lures related to free game items and hacks. The heuristic firings confirm the presence of malicious redirector links and a general lure for game hacks. The document body, though partially garbled, contains text related to 'Free Stuff On Roblox' and a URL that aligns with the malicious findings.

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 https://netcdn.xyz/app/431946152/free-stuff-on-roblox-game-hack In PDF document text
    • http://ghknights.org/images/coun-master_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://ghknights.org/images/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.ghknights.org/images/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://ghknights.org/images/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • https://www.ghknights.org/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.ghknights.org/images/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://www.ghknights.org/images/free-robux-net_GM431946152.pdfIn PDF document text
    • https://www.ghknights.org/images/robloxhacks_GM431946152.pdfIn PDF document text
    • http://ghknights.org/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://ghknights.org/images/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://ghknights.org/images/roblox-script-hacks_GM431946152.pdfIn PDF document text
    • https://www.ghknights.org/images/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://ghknights.org/images/coin-master-spin-link-2021_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://ghknights.org/images/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ghknights.org/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://ghknights.org/images/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000474a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x474A 29284 bytes
SHA-256: 3642fd8146d20d603c3105d8cb05e66f453df2db5bf80fef621657b656c4a957
font_01_sfnt_off00008cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF8 18192 bytes
SHA-256: 903941a417559e7684521db1d707d12e6b393a834b1c6361693a3f5a10f7088f

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