Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6f6c9dc6bc3f15…

MALICIOUS

PDF

36.0 KB Created: 2021-07-04 11:40:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0f0841aee779f3864a1a5f454c34f26f SHA-1: c20aeb75ea838630b42b3833bc9d9179331b9a55 SHA-256: fe6f6c9dc6bc3f159101707375b89d0cd4ee88a377d486dfdd9a8286e0b051ab
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/coin-master-daily-free-spins-link-app-game-hack. The document body and heuristics indicate a lure for game-related cheats and free items, suggesting a phishing or scam attempt. The presence of multiple links to external PDFs, some with numeric slugs, indicates a link farm designed to attract traffic.

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-daily-free-spins-link-app-game-hack In PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/free-robux-images_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/pastebin-roblox-promocode-hack_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/best-free-avatar-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/roblox-hack-deutsch-pc-weg-machen_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/roblox-hack-free-download-no-survey_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/roblox-free-admin-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/loith-gaming-free-robux-no-waiting_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/nonsense-diamond-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/balloon-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/cheat-engine-roblox-shut-down_GM431946152.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://www.mtsn3bulukumba.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.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_002_off0000340a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x340A 23272 bytes
SHA-256: cb3a98db77450ba7886c395fb2ffce2b29401ba687ecfa8f78b96afb6884fa7b
font_01_sfnt_off000068c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68C7 18768 bytes
SHA-256: 1c5db3f7009fa9a9146ade2cbc2efb97c7baf1b0638c7caf06dc3a4af7679f36

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