Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d2bfd529c78252…

MALICIOUS

PDF

35.3 KB Created: 2021-07-19 09:44:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d51f85d5a5cfb41ec3833e9b96c27c56 SHA-1: 83b85d6733fe045cbc00a01c885722638e3d6831 SHA-256: a7d2bfd529c782528af96aeb4a840536cad81aad087b11f1bceba1109961c9cb
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to redirector infrastructure, specifically promoting 'free generators' and 'hacks' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-free-spin-link-today-2021-game-hack, which is associated with malicious redirector activity. The document's structure and embedded links suggest an attempt to trick users into visiting potentially harmful sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-free-spin-link-today-2021-game-hack In PDF document text
    • http://ff-klaffenbach.de/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://ff-klaffenbach.de/images/free-promo-codes-for-robux_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
stream_002_off00003181.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3181 23312 bytes
SHA-256: 58331a70bbc696f04ea1d50d43fb7d9089809ce2002080409ae83ae0c36af0b9
font_01_sfnt_off0000665b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665B 18812 bytes
SHA-256: 209d45ed87732d827821998a5283e56b95c39a3af4032faff2e6da7d3e76f78f