Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e75fdf97755a135…

MALICIOUS

PDF

45.0 KB Created: 2021-06-08 09:56:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7e732817ca8bc9ecd99372f750f07c50 SHA-1: 008a8f37bc0ec8585eb652b86eba34994e438ed4 SHA-256: 1e75fdf97755a1351bb6a96b6caeeda1dd51b7f53c35680fca92796141b168ff
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, including a primary redirector URL associated with game hacks and cheats. It also exhibits characteristics of a link farm, with many URLs pointing to other PDFs hosted on a similar domain, likely for SEO manipulation. The presence of a visual download button and instructions for password-protected archives suggests a workflow designed to trick users into downloading potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.tw/app/431946152/cheat-engine-roblox-tricks-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-rewards_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-co_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-tools_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hacked-roblox-game_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/2021-coin-master-hack-without-verification_GM406889139.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_off00005039.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5039 25912 bytes
SHA-256: 098587f92340cb50062b184679c71212bebd41725756ffa66df7d40cd87f4dbe
font_01_sfnt_off00008b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B8C 18860 bytes
SHA-256: 1cfe6221187f0c0166bec73023c5fd05da2b361643c025ce70f0e721cf612718

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