Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db13c165d626e67…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 18:00:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9cdda28b0d26c56c6670658ccdfb7620 SHA-1: 9590612cfc2d824c36fac6aeef5a1ee4b67c559b SHA-256: 1db13c165d626e67af355dd17e4d4438cfc74435b53da4afb314d593a37347ad
220 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, including a primary link to a known malicious redirector at http://netcdn.tw/app/431946152/nope-hack-roblox-cheat-engine-64-game-hack. The document body and heuristics indicate a lure related to game hacks and generators, suggesting an attempt to trick users into visiting these sites. The presence of numerous PDF links further supports a link farm or SEO poisoning tactic to distribute malicious content.

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/431946152/nope-hack-roblox-cheat-engine-64-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/apk-hack-online-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/is-there-a-way-to-hack-stats-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/serveur-discord-hack-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/get-more-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-no-human-verification-android_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/gaming-tutorials-com-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-install-anti-hack-for-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-robuxfor-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-roblox-on-pc_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-in-somebodys-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-cards-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-how-to-get-robux-for-free-2021_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_off000030cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CC 23028 bytes
SHA-256: 91f9f225c19e9fcdf330917f42cc79942eac7bdc4e501d3dc0f7ba217d80373e
font_01_sfnt_off00006478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6478 19452 bytes
SHA-256: 59da55e61f1f0b30f0a66b7c8dcfc755479728a891b5ffd530e7c0ac4eb8423e

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