Malicious PDF — malware analysis report

Static analysis result for SHA-256 921ee88a7fc56f49…

MALICIOUS

PDF

42.3 KB Created: 2021-05-15 03:21:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4ecb9a3378782b2baed003f928ecb49b SHA-1: 2282b5641575030f32157b78f5904b39804f9550 SHA-256: 921ee88a7fc56f49fc0094f62a8efb1b874c5d5afbb4d66087720b2c90044c75
168 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users with promises of game hacks and free currency, redirecting to a malicious domain. The ML classifier also flagged this PDF as malicious with high confidence. The document body and embedded URLs strongly suggest a phishing or scam attempt to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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-get-a-lot-of-robux-game-hack In PDF document text
    • http://umksn.pl/images/level-coin_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-daily-free-cards_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/robux-gainer_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004963.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4963 25244 bytes
SHA-256: 7898a0392c0ba98260ec8b5317db0b2e312d0dbc34715c7a27b294d069cd7ef3
font_01_sfnt_off00008359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8359 18120 bytes
SHA-256: 042a1857860dc696e0dbe9c9f325bf17f11d6ec89e659ed0d278e4175a2693af

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