Malicious PDF — malware analysis report

Static analysis result for SHA-256 269f83774e8aa38d…

MALICIOUS

PDF

35.5 KB Created: 2021-07-19 18:03:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 797f046418543a8f1febbb6ed26b9eed SHA-1: 36914288b116c01f96e671b89bd8d9e78099fc87 SHA-256: 269f83774e8aa38d079fb1fcdd6b3839ed4300de4ae85427e06e69109125774a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, including http://netcdn.tw/app/835599320/free-tiktok-views-game-hack, which is flagged as malicious. The document body and embedded links suggest a lure for 'free generator' or 'game hack' content, a common tactic for distributing malware. While no scripts were explicitly extracted, the PDF structure and malicious links indicate a high likelihood of redirecting users to a malicious site for further exploitation or payload download.

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 http://netcdn.tw/app/835599320/free-tiktok-views-game-hack In PDF document text
    • https://cleansui.com.tw/image/data/files/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://cleansui.com.tw/image/data/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://cleansui.com.tw/image/data/files/how-to-hack-someones-account-on-roblox_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
font_00_sfnt_off00003527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3527 23636 bytes
SHA-256: 855f77c116977552ff66d2f6e5f5e6835c9a47010d57e42ff6f8d4749a28b129
font_01_sfnt_off00006aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA4 17752 bytes
SHA-256: fbbed6aa406878393a00abdc0937322fa009c5b8448fdc35bdb3145f27770f26

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