Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bebfd29a9095041…

MALICIOUS

PDF

49.2 KB Created: 2021-06-09 06:32:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 210360c1437641be366ac2786ce8203b SHA-1: 5f07ff1c8ff639a62ac23e0558fefc65e6f1e741 SHA-256: 8bebfd29a90950413bff213084c21af16a7b65bf11867eebc7f49b17c5b31d02
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a malicious redirector link disguised as a 'game hack' lure, which is designed to trick users into clicking it. The document also presents a fake CAPTCHA or human verification prompt to further entice the user to interact with the malicious link. The embedded URLs and the ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/i-was-hacked-by-liepa20212021910-on-roblox-game-hack In PDF document text
    • http://berntfoto.dk/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/tiktok-free-pizza_GM835599320.pdfIn PDF document text
    • http://berntfoto.dk/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-robux-on-roblox-for-free-ipad_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/114-4-hacks_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/free-coin-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/roblox-scratchy-youtube-how-to-get-free-games_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/antivirus-free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/cmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://berntfoto.dk/images/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://berntfoto.dk/images/robux-gainer_GM431946152.pdfIn PDF document text
    • http://berntfoto.dk/images/how-to-get-free-spins-in-coin-master_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50BB 28732 bytes
SHA-256: 9b794e5b121738d235b8336392934fda19d8a77b20e6d89d8541c02f32f71771
font_01_sfnt_off00008f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F94 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00009943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9943 19596 bytes
SHA-256: 3020c8c9ccb96961c9f139963ca3a2513b2d25626590645dd36992ce15054f5c

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