Malicious PDF — malware analysis report

Static analysis result for SHA-256 e439665f71df69f4…

MALICIOUS

PDF

35.6 KB Created: 2021-07-06 09:29:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8d237410d296735eb09d74d673db70ff SHA-1: 481bad8474c9d7bd724763218dcf25133919230c SHA-256: e439665f71df69f48643540a320e7dc5f3ac34afc4778adb6712742aa30f48d8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and game hack lures. The primary lure appears to be 'free game hacks' for popular titles like Minecraft and Roblox. The document's structure and content suggest it's designed to drive traffic to these malicious sites, potentially for further exploitation or ad fraud. No scripts were extracted, but the PDF's structure and embedded links are indicative of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/479516143/minecraft-java-edition-free-download-for-android-game-hack PDF link annotation
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-items-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-apk-hack-android_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-hack-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-use-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-hacks-for-cards_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-free-spins-on-coin-master-hack_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_off000034a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34A5 22864 bytes
SHA-256: 66fe265b7bb59f2609789d303b3bd5e89e6566bfac812afd8022389ad6b05e49
font_01_sfnt_off000066ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66AE 18856 bytes
SHA-256: c43022659d2334bb80aa9650c1d831b37683b3bffb68bd4d8ca36e01fa2f38bf

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