Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc263735ddc5bbd…

MALICIOUS

PDF

47.1 KB Created: 2021-06-04 00:07:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0ef6c6f7673f41d285526b061df87f39 SHA-1: b148b9ce2a899d7d35978bb01d5f757d707db206 SHA-256: dcc263735ddc5bbddc1f920808d0839586d1f5a9bb73959398d833d5af1cc687
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users to external websites, including a known malicious redirector. The document body and extracted links suggest a scam related to free in-game items or cheats. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/406889139/free-coins-coin-master-today-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/tiktok-free-videos_GM835599320.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-game-hack-version-download_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-can-you-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52FD 24784 bytes
SHA-256: c8aa1aa62b3c1cad6dbf77490356073fab2080f80509ed363dffbc5917891a33
font_01_sfnt_off00008b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B08 3124 bytes
SHA-256: a0e4a5f378f23ac829e40ef1a0638115ffab18b17acd7561ed9b637601232063
font_02_sfnt_off000095eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95EB 18064 bytes
SHA-256: 85a7a6543eb7f59a149e6876aabd32521cb1fc93bcbc39754761d1a657ff29d4

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