Malicious PDF — malware analysis report

Static analysis result for SHA-256 26aa218dc4c2b1e2…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 17:59:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: aeb9ade1d981c5323badb63b6d1313d3 SHA-1: e75957c33c4b6db58082411ebcd4df721ac3bdd1 SHA-256: 26aa218dc4c2b1e2768c3d6928b86791b20acf4351ddeb22ede50f55b5ff71e3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure for game hacks and free currency, aiming to trick users into clicking malicious links. The primary link, http://netcdn.tw/app/431946152/hack-for-free-robux-with-no-servey-game-hack, is identified as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a potential for exploitation or redirection to a malicious site, likely involving client-side execution.

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/hack-for-free-robux-with-no-servey-game-hack In PDF document text
    • https://razredna-nastava.net/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-free-gears-hat-faces-clothes-2_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-666-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-hack-rc7-download_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/promo-code-list-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/cute-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/i-need-robux-for-free_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/where-to-get-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-pe-hacks_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
font_00_sfnt_off00002b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B06 23372 bytes
SHA-256: a113de8430f0e3ac27752cbd3b629f354543f5b7b4bfc7c2e4b3614e5e29b2da
font_01_sfnt_off00005f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1D 19768 bytes
SHA-256: 15b85e4e137d91392937f94a3426cfbb8954abe6e546882c388ee2ff1f76dc6a

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