Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3f2d2417170f52…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 21:19:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e2351e9be3adb61a036ebda77bea0bb9 SHA-1: 2089417874f1befe34762b0e4fa1b83e8228cca2 SHA-256: af3f2d2417170f522e93700224c0830ea575d82864da6a3a628f930bdd57dedc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a prominent redirector link that is flagged as malicious. The document body and heuristics indicate a lure for free game currency (Robux) or hacks, likely leading users to scam sites or further malware. No scripts were extracted, but the presence of malicious redirectors and the lure suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-websites-2021-game-hack In PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/robux-withdraw_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/robux-page_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-hacks-2021-free-robux_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/how-to-get-25-robux-free_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-black-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/roblox-free-group-funds_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-boost_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/coin-master-free-spins-and-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-robux-come_GM431946152.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • https://www.dc-itsolutions.com/userfiles/files/free-downloads-for-coin-master-daily-rewards_GM406889139.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_off00003039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3039 22528 bytes
SHA-256: d2ca378d690115199eba366542bc742109d581d388b275931ae02455e45f9173
font_01_sfnt_off0000623d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623D 19540 bytes
SHA-256: 7dbc8426627c63cb62956a50d2295124057d24afa4e6276b198320b3de5f5879

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