Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e2ff0e085ce675…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 14:47:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 414a617d6cd0c14b3f1781e8a643ddf1 SHA-1: e01c341b436a63555e14bb6bcb5b9f7c88c93a74 SHA-256: 81e2ff0e085ce6750ed601d3183f49f1ca79b4fb406f906e1dd43c99e4e4df9d
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, including a primary redirector URL associated with malicious activity. The document body and embedded links suggest a lure for game-related cheats or currency, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a malicious redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/coinmasterfreespinlink-game-hack In PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/impact-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/how-often-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/roblox-a_GM431946152.pdfIn PDF document text
    • http://psb.sd-alazhar29.sch.id/repository/free-pet-snacks-coin-master_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_off0000516c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516C 24308 bytes
SHA-256: b2f1e047fba4538050ab8654db1e5f1d2d2a033f82ef6663e99643dd97b384e1
font_01_sfnt_off0000890b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x890B 18224 bytes
SHA-256: 5ac1ce2ac88e7b98134a23e8a83b406c8e40c127b2dbab09a4edbea00c7c47cb

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