Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0dbb519bc1d4634…

MALICIOUS

PDF

44.3 KB Created: 2021-05-11 13:34:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 201133077e5ce0486b7e3893c8e5cc15 SHA-1: 615a1bc568063a7c6c8cb1443494fdfdb05e5337 SHA-256: c0dbb519bc1d46341f7af5b74df4f3601923d8e7a194910dc073f0f2b259eba0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "Coin Master Hack App" and similar game-related lures. The document body and heuristics indicate a redirection workflow designed to trick users into visiting these malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/coin-master-hack-app-ios-game-hack In PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/free-100-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-not-a-scam_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_003_off00004b6e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B6E 29320 bytes
SHA-256: c59ecc5446b40ca941d5fd0f5da7d4f4d250aaffc534c60d1a03b6d457211a50
font_01_sfnt_off00008bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEC 17892 bytes
SHA-256: 842ebafe75553617aa3406336693b508b1df3cd42ae030bb56c7cc7ab7429b4f

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