Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c81bc07f994e3a…

MALICIOUS

PDF

42.2 KB Created: 2021-05-17 16:09:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 09449c15d60496295f12e1095cc0ab92 SHA-1: 95e1a39d17267ba069b5575dd5ec1b4b897d1fb7 SHA-256: 37c81bc07f994e3a820cffc50e1b869f65f18366dc43349ca5a0f58ce1827c23
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'generators'. The ML classifier strongly indicated maliciousness, and the presence of a visual download button further supports a deceptive lure. While no scripts were extracted, the embedded URLs and heuristic firings clearly indicate a phishing or scam attempt designed to redirect users to potentially harmful sites.

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 https://netcdn.xyz/app/479516143/minecraft-hack-client-download-game-hack In PDF document text
    • http://itbits.ie/images/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://itbits.ie/images/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
    • http://itbits.ie/images/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://itbits.ie/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://itbits.ie/images/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • http://itbits.ie/images/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://itbits.ie/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://itbits.ie/images/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://itbits.ie/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://itbits.ie/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://itbits.ie/images/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://itbits.ie/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://itbits.ie/images/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://itbits.ie/images/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://itbits.ie/images/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://itbits.ie/images/minecraft-games-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://itbits.ie/images/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://itbits.ie/images/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://itbits.ie/images/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://itbits.ie/images/coin-master-daily-spins-and-coins_GM406889139.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
font_00_sfnt_off00004a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A14 24872 bytes
SHA-256: 7ff9c61d67c9755d1f69d9f71081df36b6a163f256f6c59f319720469468b482
font_01_sfnt_off000081fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81FB 18460 bytes
SHA-256: f0322949221cc4e2c5002b867d751862f4cd6735e4a5ba01a0e5101b475bc55e

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