Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cfcda494aa9a59…

MALICIOUS

PDF

32.7 KB Created: 2021-07-03 21:17:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 317e8795b756fe7cafd846e603bf4193 SHA-1: d4dc60797a7750e84847ca97c4363aa8a61652ee SHA-256: 73cfcda494aa9a59cf1ea44070d8f6455233808639c09f9ef98eccc3f5246616
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary redirector URL is http://netcdn.tw/app/431946152/promo-code-free-robux-game-hack. This pattern is indicative of a phishing or scam campaign designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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.
  • 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/431946152/promo-code-free-robux-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-hack-roblox-jailbreak-go-through-walls_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/pubg-uc-free-redeem-code_GM1330123889.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-a-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-buy-headless-head-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-your-free-robux-today_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/pubg-uc-no-verification_GM1330123889.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/robux-online_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-do-i-hack-robux_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_off000029bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29BB 22008 bytes
SHA-256: 542373407f9dbf31f5f80010716ade158c3a404dc587b47b7aef90cd804c2436
font_01_sfnt_off00005a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A66 19304 bytes
SHA-256: 3279f8714710b632350f0bd88caa2cfc89f00fefd6c14113758548b23fb72056

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