Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c961bb6355085ba…

MALICIOUS

PDF

45.7 KB Created: 2021-05-20 00:53:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aec4a5068ed9dfb73b46b403289ebea0 SHA-1: 49d0baf4309452f487179856bd73f161643c476b SHA-256: 3c961bb6355085ba1e8c26096e1088dcb2e9999e1cec07b99ba39d606371e769
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to known malicious redirector infrastructure, specifically promoting 'free generators' and 'game hacks'. The document body and extracted URLs strongly suggest a social engineering lure designed to trick users into visiting potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/431946152/instant-robux-game-hack In PDF document text
    • https://www.audipec.com.br/images/free-coin-master-account_GM406889139.pdfIn PDF document text
    • https://www.audipec.com.br/images/coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://www.audipec.com.br/images/roblox-com-hack_GM431946152.pdfIn PDF document text
    • https://www.audipec.com.br/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://www.audipec.com.br/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://www.audipec.com.br/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://www.audipec.com.br/images/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://www.audipec.com.br/images/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
    • https://www.audipec.com.br/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.audipec.com.br/images/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.audipec.com.br/images/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://www.audipec.com.br/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://www.audipec.com.br/images/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://www.audipec.com.br/images/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.audipec.com.br/images/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • https://www.audipec.com.br/images/freespinandcoinblogspot-com-2021-11-coinmasterfreespins_GM406889139.pdfIn PDF document text
    • https://www.audipec.com.br/images/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://www.audipec.com.br/images/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • https://www.audipec.com.br/images/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • https://www.audipec.com.br/images/coin-master-34-4-hack-download_GM406889139.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_off00004c22.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C22 25216 bytes
SHA-256: 3820a47a139aacf3e50bf72bf7524de432db6a956bc60962675b39506b45f149
font_01_sfnt_off00008620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8620 2880 bytes
SHA-256: 552e62132cae3603ce0819827e44d96a992bd06014cc5080bf3af4b2ea155b3e
font_02_sfnt_off00008ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF9 18184 bytes
SHA-256: 234f9e95fa1241feb438ae0efba81c56d05ba2863eb0b0d090bdd6eb60e49a51

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