Malicious PDF — malware analysis report

Static analysis result for SHA-256 16136fba823b0281…

MALICIOUS

PDF

36.0 KB Created: 2021-07-05 10:03:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 122becb93b076dab58e248d755c2b2b1 SHA-1: 34d6b90a71572f92f131e698b434aade6fe5d153 SHA-256: 16136fba823b0281b7eb30060510c72630ee4f5045fd01b28453d674a6fd231e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirectors and is designed as a lure for game hacks. The document body explicitly mentions 'How To Get Free Robux Easy On Phone' and includes a primary URL that is flagged as malicious. This suggests the PDF's purpose is to trick users into visiting a site that likely hosts malware or further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/how-to-get-free-robux-easy-on-phone-game-hack In PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/hype-dance-roblox-free_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-admin-roblox-codes_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/can-you-hack-robux-using-promo-code-inspect-element_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-tiktok-likes-generator_GM835599320.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-hack-roblox-account-top-9ways_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/www-roblox-com-free-games-online_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/players-involved-in-the-2021-hack-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/hacking-mad-games-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-bonus_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-hack-a-roblox-account-password-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/hacks-robux-gratis_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-hack-roblox-for-robux-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-roblox-accounts-2021-pastebin_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_off000034ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34EC 22320 bytes
SHA-256: 1415dd521834285a55b44a98b0697f846e655dd1d97adc02e343855646a4e0aa
font_01_sfnt_off00006678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6678 19484 bytes
SHA-256: 10e6918622a1e1d776f2ac179078ec20795c6faf86adaf8098abaca9041529c9

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