Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e38d1cd70299eeb…

MALICIOUS

PDF

42.8 KB Created: 2021-05-12 22:04:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 438a1a63c1abad0929e50e26ce6194cd SHA-1: ded3300a7e4ccea792eaf5b89d6b5d7f3cab4067 SHA-256: 0e38d1cd70299eeb36d62327ae6e883e3da11fe64a77f3b4edffbd71388fa166
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' or 'game hacks'. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-games-game-hack. This lure is designed to trick users into clicking through to potentially harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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.xyz/app/431946152/free-robux-games-game-hack In PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-demon_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/download-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-robux-not-a-scam_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
stream_003_off0000483e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x483E 26244 bytes
SHA-256: 2f2f290574ebf4f4eeb0d73e203e0ac5ae1dd0ee1c05d1d7ba7cb177885c2cf7
font_01_sfnt_off00008437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8437 18500 bytes
SHA-256: 50954281d46d1092d2c36c5fba9e04257001c8c7e5b0c8732206987489559ecb

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