Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1dd24f31d4a4c3d…

MALICIOUS

PDF

33.5 KB Created: 2021-07-20 09:21:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f8cf6123ff1e543fc20fa83f043b11ef SHA-1: ef57209db2bf28e03b21c1df9cc24eec98a9e72f SHA-256: a1dd24f31d4a4c3d9876e432fdd2633bd0a7aef3b10459ea98b0176a4a68ba78
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 lures users with promises of 'free generators' or 'game hacks'. The primary link, http://netcdn.tw/app/835599320/free-likes-for-tiktok-game-hack, is identified as a malicious redirector. The document's content and embedded links strongly suggest an attempt to trick users into visiting malicious sites, likely for malware distribution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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-likes-for-tiktok-game-hack In PDF document text
    • http://aimp-market.ru/images/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://aimp-market.ru/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://aimp-market.ru/images/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://aimp-market.ru/images/free-followers-for-tiktok_GM835599320.pdfIn PDF document text
    • http://aimp-market.ru/images/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://aimp-market.ru/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://aimp-market.ru/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://aimp-market.ru/images/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://aimp-market.ru/images/free-tiktok-views_GM835599320.pdfIn PDF document text
    • http://aimp-market.ru/images/how-to-download-minecraft-for-free-on-iphone_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
stream_002_off00002ec0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EC0 23284 bytes
SHA-256: 21cd1c3dc0a430c4cc96e41babf3b98a52ed376becdbb64be635f1be04f9b41f
font_01_sfnt_off00006356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6356 17456 bytes
SHA-256: 308920fe04ba02bee84e9df39862d70534e91875b9399095fdfb0b81d81483e5