Malicious PDF — malware analysis report

Static analysis result for SHA-256 e517e7fbd8df22f2…

MALICIOUS

PDF

35.6 KB Created: 2021-07-04 12:21:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: a90b879cc9d7680303d452ab47c01c98 SHA-1: e6e594cb42a09539c85195c73b9c49b5f365fa84 SHA-256: e517e7fbd8df22f23393ede5d357e06c6895aff9b24a04bda645954990bf4f6e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game items and hacks to trick users into clicking malicious links. It contains numerous links to external PDFs and a primary redirector URL, http://netcdn.tw/app/406889139/coin-master-free-spin-link-app-game-hack, which is flagged as malicious. The document's structure and embedded links suggest it is part of a link farm designed to drive traffic to potentially harmful sites.

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 http://netcdn.tw/app/406889139/coin-master-free-spin-link-app-game-hack In PDF document text
    • http://libsmpn1balongpo.sch.id//repository/rbxdemon_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/how-to-get-omega-super-saiyan-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/roblox-hacks-robuxian-secret-forum-hack-v11_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/best-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-and-coins-2021_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
font_00_sfnt_off000033e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33E2 23316 bytes
SHA-256: cde42b26302893616f98536d25178f28e972463e54ffd8035f1a08d198e625ba
font_01_sfnt_off0000687a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x687A 18344 bytes
SHA-256: d77f5968ee6f139457a13e9b4bf1826200ab268d3ceb16018ab347131930a957

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