Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5367f9925a53b8…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 06:57:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9c5527fab278cbe5947e8a26dbba1943 SHA-1: fcf047b61cbc5effd2ff8d90b2b60f761be4daa1 SHA-256: 8c5367f9925a53b8b2560780f2e110a1bb2ab40b01b7712f839c2f0bec41daf2
260 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors and a link farm, masquerading as free game hacks and generators. The document body and embedded links suggest a lure to trick users into visiting potentially harmful websites. The presence of a 'clipboard command execution lure' heuristic indicates the document may also attempt to trick users into executing commands, further increasing the risk.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.online/app/479516143/hack-minecraft-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-a-free-pokemon-go-account_GM1094591345.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/rbx-free_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-items-in-roblox-games_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-do-you-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • https://www.youtIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000530a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x530A 24900 bytes
SHA-256: cbe16708761d0db971c0f4729cbbbf380bf38232ddde138d638addb429eb8a04
font_01_sfnt_off00008b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B57 2940 bytes
SHA-256: ae8acc7f13e86db3aed98d7dfb73e70e16f4dedb45e9f0467460b76f54e1a1bb
font_02_sfnt_off00009566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9566 17740 bytes
SHA-256: b48554faafe2bce709b64b5b5bb2139c5dbee2e20b18b96283c95ec436c1b8f7

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