Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7e3857f2d405e0…

MALICIOUS

PDF

46.4 KB Created: 2021-05-12 17:13:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 57d74b41cbace698238b78144c4aadb8 SHA-1: c2f39aaa1d007970842ac02b3ceccf99df098ca8 SHA-256: cd7e3857f2d405e0c9a117fe627ff467846d81ab6789d6025f11ea63e923ce98
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically advertising 'free generators' and 'game hacks'. The document body and embedded URLs strongly suggest a lure to trick users into visiting these sites, likely for further malware delivery or phishing. No scripts were extracted, but the presence of malicious links and the ML classifier output indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8696

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/free-spins-on-coin-master-link-game-hack In PDF document text
    • http://pisanie-nut.pl/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://pisanie-nut.pl/images/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://pisanie-nut.pl/images/coin-master-daily-free-spins-today_GM406889139.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_off00004be4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BE4 25232 bytes
SHA-256: b6158dcb222d8d26aeaa6776142fcd2dcf6bddc76acb24cd9a578a996829dbd9
font_01_sfnt_off000086bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86BB 3620 bytes
SHA-256: d859fd77b85f3b3415639a87e8809ecf698e2c52ea4a2633c07d9e96259cae8a
font_02_sfnt_off0000937f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x937F 18056 bytes
SHA-256: 892ebf3b86ae534fd3f474e2c239da2a9bb4dc91f8225dc09222a78aadec1336

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