Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b73a77ab7862bb7…

MALICIOUS

PDF

42.5 KB Created: 2021-05-14 01:36:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bfda189c7c849319a1bf4c67cfab5af0 SHA-1: b8e97fe32226cf722a98b90e4632548299988302 SHA-256: 9b73a77ab7862bb71922f77565a03751457140c540f30a4f188492079e6fbcba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures for popular games like Coin Master. The document body and embedded URLs reinforce this theme, aiming to trick users into visiting malicious sites. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of 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/406889139/coin-master-free-coins-and-spins-today-game-hack In PDF document text
    • http://zercalo.org/images/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/robux-earning-websites_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-free-download_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_off0000491a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491A 25740 bytes
SHA-256: 528dd906d4be5ea74c9f07c4a342b8742ad672f631ee73292459f1917e523500
font_01_sfnt_off000083be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83BE 18240 bytes
SHA-256: 4e9460ee7c922f2330eb91d2df2ab210a384988491c8b06196f83513902e5b38

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