Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c39ef1599ead789…

MALICIOUS

PDF

34.1 KB Created: 2021-06-20 02:59:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 88e90ab3755a4ce04d5141068d5107ad SHA-1: 2c53ef881bd41dd3a279ebac0b7d68559d1f6d7e SHA-256: 9c39ef1599ead7899543b1c84bd515b834d99bd30b4c019cf453de3f948939b2
220 Risk Score

Malware Insights

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

This PDF document contains numerous links, including one pointing to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/free-robux-for-roblox-cheats-and-guide-game-hack. The document body and heuristics indicate a lure for free game currency or hacks, likely leading to a phishing or malware download site. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for exploitation or redirection to malicious JavaScript 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.co/app/431946152/free-robux-for-roblox-cheats-and-guide-game-hack In PDF document text
    • http://digilib-pps.unja.ac.id/repository/hacks-for-roblox-legit-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-grand-blox-auto-hack_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/hacks-para-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-hack-minigame-testing-place-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/asshurt-roblox-exploit-free_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/robux-hack-cydia_GM431946152.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-pps.unja.ac.id/repository/free-robux-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_off00002edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EDB 22192 bytes
SHA-256: c4494a2654e077018e415b7bdcc10986522f1cd6e63a78c44b937e6882e44ce9
font_01_sfnt_off00005f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7C 19352 bytes
SHA-256: af5ced75b3eaa6ee73912c7dbaf261be0120e51844525e8a61b817c0bd090391

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