Malicious PDF — malware analysis report

Static analysis result for SHA-256 e873893d6440343f…

MALICIOUS

PDF

46.5 KB Created: 2021-06-09 07:35:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8314bee6f880cf5da9209f79f73ec06d SHA-1: 1f23c4c820d219eb1bbdf1d4ae35a4c41ad00685 SHA-256: e873893d6440343f08c0fae786935d55dbd3914db62003e35b755fa8904032ba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free game hacks' and 'free robux'. The document body and embedded URLs reinforce this lure, aiming to trick users into visiting the malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/free-roblox-cards-youtube-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-dll-injector-hack_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/script-for-pubg-uc-hack_GM1330123889.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-free-download-mac_GM479516143.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
stream_004_off00005499.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5499 26304 bytes
SHA-256: 43eff96b834d81a7a824e92a9c843b5083ee5e31a89f3f197dd7d9d9c55274b0
font_01_sfnt_off000091ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91EA 18756 bytes
SHA-256: d4d4cd4cc07e63bdf58da72191be501ef3f6069628fdc91de22d05ae4ac3fa89

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