Malicious PDF — malware analysis report

Static analysis result for SHA-256 541d2e68ef517ef0…

MALICIOUS

PDF

31.2 KB Created: 2021-07-04 09:54:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9569774e65ee738377c54bdd4dd4b361 SHA-1: 0948c17eee63baaa1c20a3a20c79f8a5ce721dad SHA-256: 541d2e68ef517ef071bbc1bbe0805dc2e17ea6c010f0daa011915cbe95d07406
220 Risk Score

Malware Insights

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

The PDF contains numerous links to websites offering game hacks and generators, indicating a lure for users to download potentially malicious content or visit scam sites. The presence of a malicious redirector link and a large number of SEO-optimized PDF links further supports this. While no scripts were explicitly extracted, the nature of the lures suggests potential for embedded JavaScript or exploitation of PDF vulnerabilities to achieve a malicious outcome.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

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.tw/app/479516143/minecraft-font-free-game-hack In PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-hack-apk-para-pc_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-bucks-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-hack-denis-roblox-acc_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/mobile-hacks-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-blox-piece-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/i-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-hack-noclip-download_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-adopt-me-money-hack-2021-script_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/legit-coin-master-hack_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_off000028bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28BB 21880 bytes
SHA-256: 38439ee5ddd218f815f63e9b873e801c4e7d746045854d4d0c11ca9b49f0a939
font_01_sfnt_off0000588a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x588A 17996 bytes
SHA-256: 1349cd4e0d557016c08a9b992d3688fa2f7b3c2a17b956817b71236e999620b9

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