Malicious PDF — malware analysis report

Static analysis result for SHA-256 723e456f51bb7fa5…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 09:37:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 638e194245735f91ed9564f93267a38b SHA-1: 394b37bc5193701cfb61f84fb87fad93690d3496 SHA-256: 723e456f51bb7fa59c9a2bd2d02b59ae7d2cd3e974b5c7c0fa2d24cdad33aeee
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, including a known malicious redirector, disguised as generators for popular games. The document body and heuristics indicate a lure for free in-game currency or hacks, aiming to redirect users to potentially harmful content. No scripts were extracted, but the extensive link farm suggests a phishing or scamming attempt.

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/how-to-generate-free-coin-master-spin-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-free-headphones-code_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-get-free-unlimited-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-toys-code-free-dog_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/working-robux-pastebin-hack_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-free-shirts-and-pants-girl_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-spawn-cheat_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/best-tools-to-hack-roblox-on-android_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/hack-my-boyfriends-roblox-account-back_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/your-free-trial-roblox-meme_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-gang_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/how-to-get-free-tbc-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/autou-clicker-cheat-for-jail-break-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-guest-hack_GM431946152.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_off000033b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33B6 22620 bytes
SHA-256: 15ef756cc9182e70f014546eb60885b21f0e2353a19d7bc91d62193f98eee41b
font_01_sfnt_off00006632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6632 18336 bytes
SHA-256: 44149cbd1419f5cddd2185958f28928906a990b98f16256b2ecbc419de034d9f

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