Malicious PDF — malware analysis report

Static analysis result for SHA-256 1405b9ded83ce331…

MALICIOUS

PDF

33.1 KB Created: 2021-06-26 02:28:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a85c31241502d76c551baf19950b0331 SHA-1: 8b72b3ea2d085eba4b2486be95e05ac7f8a0b230 SHA-256: 1405b9ded83ce331cb1f00c5b03781052af44ea05fc72b7da3a926cb93cce81c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'game hacks' and 'free currency' for popular games. The primary lure URL is http://netcdn.co/app/431946152/como-hackear-roblox-para-tener-robux-pc-game-hack, which is flagged as malicious. The document body and embedded URLs reinforce this lure, suggesting a phishing or scam campaign designed to redirect users to potentially harmful sites. No scripts were extracted, but the presence of malicious redirectors and the lure content strongly indicate a malicious intent.

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.co/app/431946152/como-hackear-roblox-para-tener-robux-pc-game-hack In PDF document text
    • http://www.buapit.ac.th/UserFiles/File/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-free-robux-on-a-computer-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/tiktok-free-package_GM835599320.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-roebucks_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-instantly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://www.buapit.ac.th/UserFiles/File/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 3

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
font_00_sfnt_off00002d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D32 21276 bytes
SHA-256: ba7b3b43c7a147311449d5c94e48c70e73204e46b513cea9ccca3ba59e079584
font_01_sfnt_off00005b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9F 19208 bytes
SHA-256: 324f749b6975404cf761647bb76831ef7c2c64521f7a5fccb0e53e6ffe2a052e

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