Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9fc53b4b4251af…

MALICIOUS

PDF

38.5 KB Created: 2021-05-24 03:38:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 54132fa0c6e18f72968baad68a7bcf13 SHA-1: 7b6d60b8f7cef6abc3e2a4bd7b28f2e816e91f91 SHA-256: 4a9fc53b4b4251af3144e58ebe9fe34d90fc9ca5924c119afc1234d35402d923
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to malicious redirectors, masquerading as game hacks and free account generators. The document body explicitly mentions 'Free Minecraft Accounts 2021' and 'CLICK HERE TO ACCESS MINECRAFT GENERATOR', reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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/479516143/free-minecraft-accounts-2021-game-hack In PDF document text
    • http://asiasieja.pl/images/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/free-robux-com-roblox_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_off0000340c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x340C 29688 bytes
SHA-256: d3e93329456d759eff1b347d9166af1a2d242ff2dd8eee89419d6a9d386127af
font_01_sfnt_off0000759d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x759D 18252 bytes
SHA-256: a7a52ec6c2bb565f332a4905da6a686ee34bc05df98df468ad89fd298f001152

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