Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbccfa37e5bd45b1…

MALICIOUS

PDF

44.7 KB Created: 2021-05-13 18:04:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4938cb927760fe8c9327d8e372c4afaf SHA-1: bc79d4f2654468cb06d62bae6a0a53ef1ca01b95 SHA-256: cbccfa37e5bd45b126b588e2f8d3fa324b1fb7ad3983448e6da5370cd9082320
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as "game hacks" and "free generators". The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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-hack-blogspot-game-hack In PDF document text
    • http://ambingenieria.com/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://ambingenieria.com/images/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://ambingenieria.com/images/coinmaster-spin-ml_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://ambingenieria.com/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://ambingenieria.com/images/how-to-get-robux_GM431946152.pdfIn PDF document text
    • http://ambingenieria.com/images/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://ambingenieria.com/images/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://ambingenieria.com/images/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://ambingenieria.com/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004912.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4912 24244 bytes
SHA-256: a9f3b1eb81f411d9b7738e5309d7b990f2ffac03e3aa74a0c0308e16c614110a
font_01_sfnt_off00008085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8085 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off00008b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B64 18472 bytes
SHA-256: fc8f080a928efa05f6f52a1b05c74b51efc09eaaebbfb39b5178bed858eebb61

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