Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83ff81540d29e20…

MALICIOUS

PDF

35.9 KB Created: 2021-06-25 21:43:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b9adb7bca381dedaee1daab541e81976 SHA-1: ac7b655ca265dec0b7f339d5d966029ba23034de SHA-256: d83ff81540d29e20e4dcd3c05213fec11c1a2de44512f9934ae696a4659c51f9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free game currency and hacks to entice users. It contains numerous links to external PDF files, many of which are hosted on SEO-optimized domains, and also directs to a known malicious redirector. The primary goal appears to be driving traffic to potentially malicious content or phishing sites.

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.co/app/431946152/free-robux-gift-card-may-2021-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-builders-club-roblox-trial_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/antiafk-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-no-download-or-survey_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/itv-television-centre-roblox-free_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/infinite-jump-hack-roblox-download_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/get-800-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-into-roblox-account-with-method_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/is-there-any-free-robux-codes_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_off0000321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x321F 22604 bytes
SHA-256: 27f9f5ff93aed18660c4971ae8bfd0e34443e15315c2327c731e0a512ff163c5
font_01_sfnt_off000064c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64C0 19892 bytes
SHA-256: 5408b68e810f9b92c3d1351cf3631cd71c951baaa26adaac6a1a8484f4973881

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