Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31377d5f5fd8616…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 12:39:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c3dd6d16254395c775d0b946ccd7b31e SHA-1: 4661b279495b3e815b5b80c1e04819f5f11ca530 SHA-256: c31377d5f5fd86160b47bb18df0ada73acae19f2ad41ef6491c3b02a7326e8d4
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, using the guise of game hacks and free currency to trick users into clicking malicious links. The document contains numerous links to redirectors and SEO link farms, including the primary malicious URL http://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-on-phone-game-hack. While no scripts were extracted, the PDF structure and embedded links strongly indicate a phishing or scam attempt, likely leading to further malware or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-hack-roblox-accounts-on-phone-game-hack In PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-free-spins-in-shinobi-life-roblox-125_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-hack-denis-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/robux-earning-sites_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-sketch-roblox-hacked-client_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/unlimited-robux-hack-no-download_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-cat-ears-free_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-do-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-free-robux-only-username_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-no-download-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-printable-roblox-cupcake-toppers_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/como-hackear-roblox-en-android_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-profile-picture-free-to-use_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/cheats-for-roblox-clone-tycoon-2-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/kuso-ico-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/descargar-hack-coin-master_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_off00002fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE1 22604 bytes
SHA-256: a09ae28d8ab6c9a0d7b8f7bcd0584863bb3a91607cc0d3ca3dcd15143cb09728
font_01_sfnt_off0000623b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623B 19384 bytes
SHA-256: 084794c69c3a15ed1330993b6e362ce24a67b8c731d0da79d42958a9f82904df

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