Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da9af58d3cfbd69…

MALICIOUS

PDF

40.7 KB Created: 2021-05-12 18:55:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f10eb411aa0f2aea0a5cdac814b5d62a SHA-1: c0dcd5744d2934f1b3ec92eac661e7da8f01c0b3 SHA-256: 7da9af58d3cfbd6939203f691b09071763c399e60106a3c17d3f28aab5dd96fd
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and websites offering 'free game hacks' and currency, indicating a lure for users to click through. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a download button heuristic further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-pet-food-free-game-hack In PDF document text
    • http://tah-li.com/images/coin-master-hack-ios-reddit_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://tah-li.com/images/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/roblox-hack-app_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/how-to-get-a-free-dominus-in-roblox_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/robux-download_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://tah-li.com/images/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://tah-li.com/images/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://tah-li.com/images/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • http://tah-li.com/images/grab-points-login_GM431946152.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_003_off00004529.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4529 24436 bytes
SHA-256: e2667cd73945f6083c7a9c47db11f616f6ccdb7bab17997d5b3187543d24d6a8
font_01_sfnt_off00007d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3A 18040 bytes
SHA-256: 535ede7ea2ca3106b180be61e418afdb2036289bce9acd3cf3182b6416c807a7

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