Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc37d14dd58a094e…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 00:47:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8fdd207ff39701f1abc073371f75d376 SHA-1: 30579c3a0597606258f0e428eda9a65c07cd21e1 SHA-256: fc37d14dd58a094e102a07186d4340eaaf7c3fffa0f1f2f4d556a1f2c510ce49
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links, including one identified as a malicious redirector. The document body and heuristics indicate a lure for game-related cheats or currency, suggesting a phishing or malware distribution attempt. The presence of multiple links to external PDF files implies a multi-stage download process.

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/406889139/500-free-coin-master-spins-game-hack In PDF document text
    • http://achauco.vn/public/upload/files/free-robux-really-easy_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-link_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-ou_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-november-2021_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/hack-menu-roblox-download_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/roblox-whatever-floats-your-boat-money-hack-site-v3rmillionnet_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-dominus-hat-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/where-is-the-free-apartments-in-mad-city-roblox_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://achauco.vn/public/upload/files/is-there-a-way-to-get-minecraft-for-free_GM479516143.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_off00003060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3060 23116 bytes
SHA-256: 9d6beec8c77232b808059be057b2d9624d703f0b852909d5f64833ff6147de90
font_01_sfnt_off000064a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 18480 bytes
SHA-256: 73c3da9d0f6a331a6fde753084a8aebf2b702254561fcc1354a5e6554f17134d