Malicious PDF — malware analysis report

Static analysis result for SHA-256 42af764ffe4d5b9b…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 22:52:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d74064ff0836aa998a8bffde824e39f5 SHA-1: 2994522dcc4036b76e703ebff2e758db1cfc1b76 SHA-256: 42af764ffe4d5b9b272fcaf3343d1870165fd673e96c9f751ae5da35bfb721aa
152 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 generator" and "game hack" lures. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-free-spins-cheat-deutsch-game-hack. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to trick users into visiting potentially harmful sites, likely for credential harvesting or malware delivery.

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/406889139/coin-master-free-spins-cheat-deutsch-game-hack In PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/roblox-demon_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/pokemon-go-free-yawn_GM1094591345.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-outrageous-and-robux-earrape_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-hack-skywars-roblox_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/pubg-uc-website-free_GM1330123889.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-ge_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-no-human-survey_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac//repository/free-generator_GM431946152.pdfIn PDF document text
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-on-ipad_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
font_00_sfnt_off000033b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33B2 23596 bytes
SHA-256: 4ffa71fffaad3b9dc6a7ce7a740f0d0ef1ce4686a61c049f8dcc86f69103729f
font_01_sfnt_off000068dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68DC 18648 bytes
SHA-256: 0f75c991103dc95817f01e28baa51d3b59767776a8e5ec3aab022190e4357f66

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