Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ffd24d3e5fa1a9…

MALICIOUS

PDF

46.7 KB Created: 2021-05-11 14:40:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7024aaa2a04410332559ee75575a05b4 SHA-1: 30b1dc0c8f854be5118bf94e98755bccd165dbcf SHA-256: 61ffd24d3e5fa1a9a017055754d41f81a5068e2f386386580f11d8c4d312866a
160 Risk Score

Malware Insights

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

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The heuristic firings indicate a malicious redirector and a lure for game hacks. While no scripts were extracted, the embedded links are the primary mechanism for delivering a malicious payload, likely an exploit or downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/406889139/coin-master-latest-mod-apk-free-download-game-hack In PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/gamehunters-club-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/getrobux-come_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-come_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-hack-100-working_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-spins_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-get-free-robux-for-free_GM431946152.pdfIn 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_003_off00004d71.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D71 25960 bytes
SHA-256: e3cb9b87bbe906b1da82e016600a1c0cb22730441d914119ee8c9424e2abd78e
font_01_sfnt_off00008833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8833 18636 bytes
SHA-256: e64e7c68c640d7a76083afd8b9b2f812e6e5e3722298a9911c500c059d2c6a5e
font_02_sfnt_off0000ab4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4D 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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