Malicious PDF — malware analysis report

Static analysis result for SHA-256 44773f1b0bdbe18f…

MALICIOUS

PDF

42.9 KB Created: 2021-05-15 04:30:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: aad041a1b564e1f54ef31c11274894f1 SHA-1: 853b9aff3ff23a368fcf96497ca92801342d633b SHA-256: 44773f1b0bdbe18fba91b3b8bd03f7514aa0525ec45e20edca1fc8d9c12252ff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically advertising 'Coin Master free daily spins' and 'game hacks'. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it is designed as a lure to a malicious redirector. While no scripts were explicitly extracted, the PDF structure itself contains embedded URLs that are part of the malicious lure.

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-daily-spins-link-2021-game-hack In PDF document text
    • http://lcs-schlieben.de/images/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/coin-master-hack-review_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://lcs-schlieben.de/images/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://lcs-schlieben.de/images/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://lcs-schlieben.de/images/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://lcs-schlieben.de/images/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://lcs-schlieben.de/images/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://lcs-schlieben.de/images/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://lcs-schlieben.de/images/clean-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://lcs-schlieben.de/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.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_off00004b09.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B09 24596 bytes
SHA-256: c3daa6579d620d55d79e36933e5c9c9d788b5579dc652dfc0c13d29e41a50b83
font_01_sfnt_off0000834e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x834E 18880 bytes
SHA-256: d0a5866c103c1e9d7474fc7de7eb35b8af24bd0c85b86236f9825ea4ee2a12f1

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