Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f2a449917c46c6…

MALICIOUS

PDF

32.0 KB Created: 2021-07-19 01:58:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b4ead0724a48948590d80bf45fdd14b4 SHA-1: e0bc8df450b689b54bab3dae705b2c1126a9e0a0 SHA-256: 31f2a449917c46c6310b523e65f54a6afc9217ef9bc4c64e1ab256a58a25ac2b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and lures users with promises of 'Free Robux' and 'game hacks'. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to trick users into visiting malicious sites. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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-real-game-hack In PDF document text
    • http://sfera-express.ru/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/free-robux-please_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://sfera-express.ru/images/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://sfera-express.ru/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://sfera-express.ru/images/coin-master-free-spins-link-today_GM406889139.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_off00002961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2961 22124 bytes
SHA-256: fbc6149dcb75184406ae0f3810d9269fb86096ff1d4543d2bba31ad432e1991d
font_01_sfnt_off00005a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A74 18504 bytes
SHA-256: 355fd3b799690fa6ab6c8cf295844118158e01fcbf12aab8e6bde9acc37c3376

Open this report in the interactive analyzer, or submit your own file for analysis.