Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d457e4d8cbfc97…

MALICIOUS

PDF

34.9 KB Created: 2021-07-19 04:14:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a81f3d2c55972a16265dd8b2cc8709c6 SHA-1: a0adf8bb40cb1f8b8dec4c93edb33d9a83074c6e SHA-256: 56d457e4d8cbfc9767847034a431404b6729be07cee85a6dd2c115fd0646679f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on what appears to be a "free generator" or "game hack". The primary link redirects to malicious infrastructure at http://netcdn.tw/app/835599320/free-followers-for-tiktok-game-hack. The presence of a visual download button and the overall theme suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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-followers-for-tiktok-game-hack In PDF document text
    • https://www.acacss.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://www.acacss.com/images/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdfIn PDF document text
    • https://www.acacss.com/images/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://www.acacss.com/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.acacss.com/images/how-to-download-minecraft-for-free-on-mac_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_off00003444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3444 23108 bytes
SHA-256: aea8494e76d9a540643664a989e04163db524f09e6cfb9da3543ee3c975323ca
font_01_sfnt_off00006847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6847 17692 bytes
SHA-256: 1f78b91f0c2492c05ffeec3d34563e43a0b15f4cc5b4ec219908e79cb2313b3f