Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a058b7c5f87d4e…

MALICIOUS

PDF

37.4 KB Created: 2021-05-23 02:42:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 08b151141098c887065eb2e11060a2d0 SHA-1: da1c7fb88335d2bf416828a8e690a9054d77fb66 SHA-256: 31a058b7c5f87d4eec43520e723e2a3e951d59e2c478cf5f85a912fd376d27e8
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and lures users with promises of 'free generators' or 'game hacks'. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to a malicious site, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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 https://netcdn.xyz/app/431946152/how-to-buy-robux-for-free-game-hack In PDF document text
    • http://lechia-sedziszow.pl/images/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://lechia-sedziszow.pl/images/robux-com-free_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_off0000349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x349F 25848 bytes
SHA-256: 6d5580f607377160369bc25d5a82c90cf4455102983831b7e082fb81a778d959
font_01_sfnt_off000070c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C8 18356 bytes
SHA-256: 42cf6025b0828d48dcef6abba26d08473f6f67d2383591dd07323470bab2f866

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