Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83c1bf9283b5c1f…

MALICIOUS

PDF

35.6 KB Created: 2021-06-28 16:13:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2b22015d72e797ae74c60b16cd9eb540 SHA-1: 0a67181e95a79dcb758f5ae463a11d42df11c398 SHA-256: c83c1bf9283b5c1f23c0e7cf2fee624fa03a890bceb95b42aa92c1331b4f5632
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external sites, including a known malicious redirector, under the guise of providing game hacks and free Robux. The document body and heuristics indicate a lure for users to click these links, which likely leads to further malicious content or downloads. No scripts were extracted, but the overall pattern suggests a phishing or social engineering attack aimed at driving traffic to malicious infrastructure.

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/robux-hack-no-human-verification-or-survey-2021-game-hack In PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/the-wild-west-roblox-free_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-free-downloader-igg_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-using-pastebin_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/hack-robar-cuentas-de-roblox-pastebin_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-gen-no-survey_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-superhero-package-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/unlimited-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/hack-roblox-script-pastebin_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-minecraft-maps-pe_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/roblox-www-com_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_off000031c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C3 22244 bytes
SHA-256: 5b2f88be3fb7b85ee359e6b9d8fee7aff4d0d919020b61a1b1738686c6548d4c
font_01_sfnt_off00006314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6314 20036 bytes
SHA-256: daeb3935cd677c5f295d57c51548ce9cdd3543c596d97228fe2f11291a248948

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