Malicious PDF — malware analysis report

Static analysis result for SHA-256 977c2051a9d1c501…

MALICIOUS

PDF

42.4 KB Created: 2021-05-14 09:07:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e81aab5863b4146fca53810783f08fc9 SHA-1: a557f824ef29d64f86b1dd7ac55c1ac8cc599f17 SHA-256: 977c2051a9d1c50157f6f18b38fcf2f8826556dd2a24b266adc32c8ad8b16d90
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of free game hacks and generators. The embedded URL 'https://netcdn.xyz/app/479516143/minecraft-java-edition-free-game-hack' is a primary indicator of this malicious activity. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest a phishing or malware distribution attempt.

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-java-edition-free-game-hack In PDF document text
    • http://zercalo.org/images/link-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/apk-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-executor-free-download_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/app-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/is-minecraft-free-on-switch_GM479516143.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_003_off00004a11.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A11 25524 bytes
SHA-256: 686c75487b7c6d3e211b2da846e79ce757fc4fc88d4089a1fe0e8159bf9ea6b9
font_01_sfnt_off000083b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83B7 18164 bytes
SHA-256: e28d0ded599416f75746d42b4ddd49ac4ed584cd54835945167b34c6d366202b

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