Malicious PDF — malware analysis report

Static analysis result for SHA-256 543818fae9e315fe…

MALICIOUS

PDF

46.4 KB Created: 2021-06-09 05:17:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5b047706d5386f4a7f1219fd0ec663df SHA-1: 75ffeba6caacb929106fcb5625abb795306ccfba SHA-256: 543818fae9e315fe82e3e5ef6b1761ca728db13b041818c3f8d8584c17e10a77
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a lure of free in-game currency and hacks for popular games like Roblox and Minecraft. It contains numerous links to redirector infrastructure and a link farm of other PDFs, likely designed to lead users to malicious websites or further compromise. The document body and heuristics strongly indicate a social engineering tactic to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/roblox-free-robux-generator-2021-game-hack In PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://elearning.mtsalmanar.com/__statics/gudangsoal/files/legit-free-spins-coin-master_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
stream_004_off000050c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C6 27904 bytes
SHA-256: a051fc3b22f381cfafe1448703f04f360e126d95b37ec95cd8e0a6c7e807db30
font_01_sfnt_off0000911f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x911F 18820 bytes
SHA-256: 5d2ead64db0ad31ca207c531fb8d23bcdb6cf67dcd84beac16e01571736fb436

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