Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca5ba1a93bac73e…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 19:56:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 091c65a4737e56911b1e3a4ec164a8ab SHA-1: 0092f3ccf20db48529a8158693545bbf9dda5de3 SHA-256: 7ca5ba1a93bac73ee38ca714dfaa438d0de347ba9b191e9684aedadf90a2a13a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, with a primary link identified as a malicious redirector. This redirector is associated with "game hacks" and "free generators," a common lure for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of malicious links indicates an attempt to redirect the user to a potentially harmful site.

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 http://netcdn.tw/app/479516143/minecraft-apk-114-game-hack In PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-no-playing-games-or-human-verification_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/vehicle-simulator-cheating-roblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/robux-hack-give-250k_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/carlox-hack-de-la-sable-laser-de-goku-oscuro-roblox_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-free-box_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-hack-roblox-and-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/pokemon-go-free-zoo_GM1094591345.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-hack-roblox-lumber-tycoon-2-money_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/roblox-free-pants_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/how-to-hack-roblox-accounts-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.univthamrinaka.com/repository/coin-master-hack-version-2021-free-download_GM406889139.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_off000034be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34BE 23080 bytes
SHA-256: 1840f75579629022d5281108a575365e9330b1c5c3c98b31a9f0dd10e0209a6d
font_01_sfnt_off00006844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6844 18372 bytes
SHA-256: cfa1744e15de76beef4250e2e8e5213b12ebb5623f2a1aca1772815b9c3f87cb

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