Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c478f26603b8fe0…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 05:19:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a271756a245b34defc7d60501449a001 SHA-1: fcaf4b2066c9b54eca2f8a70d49728fc551066c4 SHA-256: 1c478f26603b8fe0eaa2692a3103d1372eb5028ab2f02afe23b32114d687ac5f
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the presence of malicious links and the nature of the lures strongly suggest an attempt to trick the user into downloading a second-stage payload or visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/479516143/wizard-hacks-game-hack In PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/tiktok-likes-for-free_GM835599320.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/robux-earner_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-hoe-to-get-extra-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/100-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-15-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/master-coin-free_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • http://perpus.poltekeskupang.ac.id//repository/free-robux-groups-2021_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
stream_004_off00004ed2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED2 30092 bytes
SHA-256: 94b8f646b54acb013531680766416fbfc34ffc22ae3039912bfd0e99706868bc
font_01_sfnt_off00008e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E91 18088 bytes
SHA-256: 8b77488254b6aca3f83796c067843361ab864d2cfeb655e2bb6c253d8b72d837

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