Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd5b54616ea235e…

MALICIOUS

PDF

41.9 KB Created: 2021-05-12 21:08:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a99c509990bcffffe42ba8603101aaf5 SHA-1: 2ec9986c164cba56421f2892e103afcba49c9986 SHA-256: 3bd5b54616ea235e732c0ee561194eb7b33553c87b16d085af7aa8d61dbe6ffb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to redirect users to malicious infrastructure, masquerading as a 'game hack' or 'free generator'. The primary lure URL is https://netcdn.xyz/app/406889139/como-hackear-coin-master-sin-verificacion-humana-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a social engineering attack aimed at driving traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/como-hackear-coin-master-sin-verificacion-humana-game-hack In PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/coin-master-free-food_GM406889139.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.man2smd.sch.id/__statics/gudangsoal/files/free-generator_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_off000049e6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E6 24408 bytes
SHA-256: 97dca0c28527ce3412ddd39a34536fa16ec40534b130b1809e988a88fb540a18
font_01_sfnt_off0000818e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x818E 18248 bytes
SHA-256: d58a885b6f163a7ca0f7a3e2bcb77843ebffb47d35b4abec401cc00d34780d65

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