Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3810766abca536…

MALICIOUS

PDF

44.3 KB Created: 2021-05-13 02:00:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7bdb6ddff6f5fe30ab8e8c5d851332af SHA-1: 2f2f71430e92cc1728d37eed30497dda0fda9412 SHA-256: 1c3810766abca5369f524e234749429c478510f69556345a3d837a4f9caf27bc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free game hacks' and currency. The primary lure appears to be a link to 'free-robux-codes-2021-not-used-game-hack' hosted on netcdn.xyz. The document body and heuristics indicate a social engineering tactic to trick users into visiting these malicious URLs, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/free-robux-codes-2021-not-used-game-hack In PDF document text
    • http://papelesyempaques.co/images/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://papelesyempaques.co/images/toolbox-for-minecraft_GM479516143.pdfIn PDF document text
    • http://papelesyempaques.co/images/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://papelesyempaques.co/images/coin-master-mod-apk-latest-version-free-download_GM406889139.pdfIn PDF document text
    • http://papelesyempaques.co/images/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • http://papelesyempaques.co/images/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://papelesyempaques.co/images/minecraft-launcher-download-free_GM479516143.pdfIn PDF document text
    • http://papelesyempaques.co/images/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://papelesyempaques.co/images/coinmaster-hack_GM406889139.pdfIn PDF document text
    • http://papelesyempaques.co/images/robux-game_GM431946152.pdfIn PDF document text
    • http://papelesyempaques.co/images/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • http://papelesyempaques.co/images/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • http://papelesyempaques.co/images/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://papelesyempaques.co/images/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • http://papelesyempaques.co/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://papelesyempaques.co/images/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://papelesyempaques.co/images/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://papelesyempaques.co/images/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://papelesyempaques.co/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://papelesyempaques.co/images/roblox-promo-codes-for-free-robux_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_off00004a7e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A7E 26616 bytes
SHA-256: b34217fd0aa3f05d7ae7924ae1662caf055a0e82c3f13c42aa2435247a2b24b4
font_01_sfnt_off000088da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88DA 18880 bytes
SHA-256: 342a41804753b243bf13fa7c19db71c7debbb8fa80f4750c82899b0ccf7aa343

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