Malicious PDF — malware analysis report

Static analysis result for SHA-256 815e4dd8a2507bf6…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 12:03:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0f17ff5d1331eb7733ffe635b0ccd4a5 SHA-1: 0346261dc51a06506128138bc32f1e6be442fd13 SHA-256: 815e4dd8a2507bf65df97b408df3183d396da9731303ac095811977326c76e18
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'free game hacks' and similar lures. The document body and heuristics indicate a redirection to a URL that likely serves further malicious content, potentially exploiting PDF vulnerabilities or delivering additional malware. The ML classifier strongly supports the malicious nature of this PDF.

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/406889139/get-coin-master-spins-free-game-hack In PDF document text
    • http://pustaka.bbppketindan.info/repository/get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/hack-roblox-bee-swarm-simulator-pc_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/download-free-robux-app_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-cards-free-cards_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-click-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-cheat-engine-patch-bypass_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-robux-from-jailbreak_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/hack-roblox-red-boy_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-get-free-robux-without-using-apps_GM431946152.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31EA 23584 bytes
SHA-256: c1d79fbe63e7665c2599ff1a95097eaad52b3b3a5ed21240feea15c036a47ad4
font_01_sfnt_off0000664a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x664A 18176 bytes
SHA-256: 3c1755862e9d7b6c118913672ec91aceec4079bd066dd8ef58651bb045fdbbfe

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