Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c747fb62f45cc1…

MALICIOUS

PDF

31.1 KB Created: 2021-07-20 16:20:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 72f623d4c8b454f287510ee12ddbd8c1 SHA-1: 7d20d6cf6895c9e4cfbe528159ee4c534562447f SHA-256: 38c747fb62f45cc15efaa4eed4d6d84e2ff0ba84169fb714045ea9d16f577635
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to http://netcdn.tw/app/835599320/free-tiktok-video-game-hack, which is identified as malicious redirector infrastructure. The document body and embedded links suggest a lure for free game hacks or generators, a common social engineering tactic. While no scripts were explicitly extracted, the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of a malicious workflow, likely involving redirection to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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-video-game-hack In PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-robux-legit_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stifar.ac.id/repository/get-minecraft-for-free_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
font_00_sfnt_off000027a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A6 22088 bytes
SHA-256: c3ff0bd5b5d5905483961235a268ba95103292877457ff821d52fb1aca2354d2
font_01_sfnt_off000058b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58B9 17764 bytes
SHA-256: 235ab7ad76fbd6febe16a9da060cefd2b4630fdfb887c9c84e88c01a352496ee

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