Malicious PDF — malware analysis report

Static analysis result for SHA-256 be99654ae4f94a3a…

MALICIOUS

PDF

33.9 KB Created: 2021-06-25 15:29:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7071421643aab1f456682f807f24017c SHA-1: 7b00e3d126622ca6a19616591da0240f4e488da9 SHA-256: be99654ae4f94a3a0c52268dc601b3a9e03b01f56e73be5eac6f37545cab9917
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, specifically advertising game hacks and free generators. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's designed as a lure for potentially harmful content. The primary attack pattern involves tricking users into visiting these malicious links, likely leading to further malware downloads or credential harvesting.

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.co/app/431946152/all-roblox-hack-scripts-game-hack In PDF document text
    • http://library.acehresearch.org/repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/robux-free-ilimited_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-test-or-dowmload_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/generator-get-free-robux-denisdaily_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/block-hunt-hack-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/did-roblox-get-hacked-in-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-offline-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-on-tablet-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-spins-coin-master-2021_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_off00002e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E4C 22044 bytes
SHA-256: 5f22e4da5e0faab6589f7fe4cc31516fc8f7bbaf6afe35aa4dd565cfe7c82603
font_01_sfnt_off00005f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3D 19056 bytes
SHA-256: 45d37005f30ca24e639b80d314f4039b21dbdd398d4caa5e3b777f39dd19b14a

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