Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8b4887e5c122f8…

MALICIOUS

PDF

31.7 KB Created: 2021-07-04 16:01:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f4823303288dabd881d7ff3c4da9a6b8 SHA-1: f7d2d243f509c0045f0c57a131264e75e57c3f3b SHA-256: 1a8b4887e5c122f89bf495235467f970f014840f3c4492d264b4d1535580831b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting "free generator / game hack" lures. The primary link, http://netcdn.tw/app/431946152/no-scam-free-robux-game-hack, is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into visiting potentially harmful sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 3

  • 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.
  • 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.tw/app/431946152/no-scam-free-robux-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/get-free-spins-coin-master-october-2021_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/hack-coin-master-dzooka_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-remotes-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-hack-roblox-prison-life-v2-02_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-free-spins-reddit_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/como-tener-ropa-gratis-en-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/2021-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/pokemon-go-no-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC7 22800 bytes
SHA-256: e9c754745382ee09efb87597518a91f58da01fd0adf487081b8a08fef13469fd

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