Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a8251858726ff3…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 18:54:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7b30e73746eff92d9e7712f99102be6b SHA-1: 39cf9c57aaaaac53167a5b61e93f48ebe34cc71b SHA-256: 38a8251858726ff3ca961734b761415aca72e8865f33178bea269c34a63f0356
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure, specifically advertising free game hacks and currency. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates an attempt to lure users to potentially harmful content or further stages of an attack. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or scam attempt.

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/431946152/blox-world-free-robux-game-hack In PDF document text
    • http://cleansui.com.tw/image/data/files/19-diamond-roblox-hack_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/apocalypse-rising-roblox-cheats_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/pokemon-go-fake-gps_GM1094591345.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/real-roblox_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/legit-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/coin-master-hack-without-downloading-apps_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/rolox-free-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/generator-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/tiktok-free-view-iphone-6s_GM835599320.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/free-robux-generator-for-ipad_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-to-hack-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox-jailbreak-cheats-2021_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/coin-master-card-hack-apk_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
font_00_sfnt_off00002ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF1 22060 bytes
SHA-256: 41eb2d55f95f0db97a4869574229fd09513d10b7bad4d9510b86965f6e8442a4
font_01_sfnt_off0000605b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605B 19160 bytes
SHA-256: 42e554ef2c91bbb5af350d4b1f45d0a0f829397bc38bc7c2009f5bdaf8074c39

Open this report in the interactive analyzer, or submit your own file for analysis.