Malicious PDF — malware analysis report

Static analysis result for SHA-256 276ca1f95969890b…

MALICIOUS

PDF

47.3 KB Created: 2021-06-03 12:06:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 08b0bc1bfde3cab130c07ae52d1e2cdc SHA-1: 91f6e31a025a081675729a3c3ce4b66d42b03ebc SHA-256: 276ca1f95969890bbc08ca551465abdf17b19c77f23ad5ca1b83bcf387bdd379
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a lure for game hacks, specifically mentioning 'free Robux'. The primary URL directs to a site offering a 'game hack' which is a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.online/app/431946152/how-to-get-free-robux-as-a-kid-game-hack In PDF document text
    • http://library.umla.ac.id//repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/robux-scam_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-attack-madness-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/www-coinmaster_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F7C 24660 bytes
SHA-256: cdf658bcc0a8246c2ecfe0a78f473b6979956c2336da827ea5acc48862ea5e96
font_01_sfnt_off000087eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EB 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000094fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94FD 18576 bytes
SHA-256: 4c8bb362127e72cdfb7b8bc61e06feb9a8380d66f35d9d696249482728f37543

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