Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8c245a4f991664…

MALICIOUS

PDF

31.6 KB Created: 2021-07-19 06:26:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 346d3513a7406f1f319cca954088b733 SHA-1: 30243f835a4c68107c9ba19ee9f68ace87892403 SHA-256: df8c245a4f991664462f10977e6ac5257754fb72de1484a8004dec033d13071a
160 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'free Robux' and 'game hacks'. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malicious content or downloads. No scripts were extracted, but the presence of malicious redirectors and the lure suggest a phishing or scamming attempt.

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/431946152/free-robux-scams-game-hack In PDF document text
    • http://magnipsor.su/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://magnipsor.su/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://magnipsor.su/images/coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://magnipsor.su/images/free-robux-real_GM431946152.pdfIn PDF document text
    • http://magnipsor.su/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://magnipsor.su/images/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://magnipsor.su/images/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • http://magnipsor.su/images/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://magnipsor.su/images/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://magnipsor.su/images/free-robux-hacker-us_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_off0000269a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x269A 22224 bytes
SHA-256: 1640a541fbf15fe2bd28dce47edea2dfe2d54a4206aaee915f6f2582d00eef30
font_01_sfnt_off000057f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57F9 18688 bytes
SHA-256: b778a3c2a99961d14742e517d070f3eb9b56258bc2372469447924e166dcdd4d