Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cbc35bfccea769…

MALICIOUS

PDF

35.9 KB Created: 2021-07-01 08:51:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a3f22f0ecd69693f11db2d6a75c57cf3 SHA-1: ab2216e7ecb25e6546e72b856752ceecfd1e179c SHA-256: f5cbc35bfccea769dd773a6458fce16d1172b95da2f4e9d329253435f13c797a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/hack-robux-2021-do-inspect-element-game-hack. This infrastructure is used to lure users with promises of game hacks or generators, likely leading to further malicious content or downloads. The document body and heuristics confirm the intent to redirect users to potentially harmful sites.

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 http://netcdn.co/app/431946152/hack-robux-2021-do-inspect-element-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/robux-games_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-promo-codes-december-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-cheat-ninja-legend_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/download-hack-roblox-2021-fr_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-your-hacked-account-back-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-join-free-roblox-builders-club_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-best-free-outfits_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/pokemon-go-free-team-change_GM1094591345.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-youtube-live_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-birthday-printable_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-game-called-roblox_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
font_00_sfnt_off00003203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3203 22640 bytes
SHA-256: 782a4441dcfb787a34c679d53739a85b5e61ae2087d15ee54f3ee76a799f65e1
font_01_sfnt_off000064c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C7 19908 bytes
SHA-256: 3ce4f9e67c88e221e03dec3d3a5f3a2074e9722b317e6dde7d605b4d00a453c3

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