Malicious PDF — malware analysis report

Static analysis result for SHA-256 6816288e8b09884f…

MALICIOUS

PDF

30.0 KB Created: 2021-07-19 07:00:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 780b248283f956c2cefba99f20478a0f SHA-1: 2b461925c8f9a8d6ff743ceb27aaec0ce5b3331b SHA-256: 6816288e8b09884fff9f951fd12dc9615613a6c44cd3e734237dba7720cd235d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a lure for free TikTok accounts and game hacks. This link is the primary indicator of malicious intent, likely leading to a phishing or malware download site. While no scripts were extracted, the PDF structure and embedded URL strongly suggest a social engineering attack aimed at tricking users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0560

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-accounts-and-passwords-game-hack In 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_off000020b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B9 22768 bytes
SHA-256: c943940ca1feaf3cc49ab810ad3a43ea60ea064bda6c636b5e29d191de2b3d9e
font_01_sfnt_off0000538f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x538F 18316 bytes
SHA-256: bbd6b533d869a7a089323291600526adae2a42e90d5e0cf5c01053f7505e7d8b

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