Malicious PDF — malware analysis report

Static analysis result for SHA-256 def97dfc53ee8df4…

MALICIOUS

PDF

32.2 KB Created: 2021-07-20 10:51:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a4006bfe9ff4cc9fc49d26ac954ef188 SHA-1: bfd1fc8e867b159e05fd6da3538ca857857647dc SHA-256: def97dfc53ee8df4081a8201afb6aaa8e4b76c9f60326d338d78d95f59df9d88
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains, including one specifically identified as malicious. The document body text and embedded links suggest a lure for free game items or hacks, a common tactic for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a high likelihood of redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/479516143/minecraft-toys-for-free-game-hack In PDF document text
    • https://biljartenbarendrecht.nl/images/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • https://biljartenbarendrecht.nl/images/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://biljartenbarendrecht.nl/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://biljartenbarendrecht.nl/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://biljartenbarendrecht.nl/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://biljartenbarendrecht.nl/images/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://biljartenbarendrecht.nl/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://biljartenbarendrecht.nl/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://biljartenbarendrecht.nl/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://biljartenbarendrecht.nl/images/free-robux-generator_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_off00002b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B35 22504 bytes
SHA-256: 54b534cf680c60d019a6372902d0278f3ee3ddc99182554fc6032544a35b6f47
font_01_sfnt_off00005d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D2B 17888 bytes
SHA-256: 58cd9c25f2055972b1f3d8fd7725b840dc665585bc5f994aadd02011a7a39e9c