Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c74a4dd1beec325…

MALICIOUS

PDF

35.5 KB Created: 2021-05-22 13:04:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 03123b4f5a8365999d34de347866e220 SHA-1: 60b2ab809a968a111c16647f298b947f0b5526b0 SHA-256: 4c74a4dd1beec3258d252d9617c6c786d418313caea4c469824fc10ddc864a07
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as offers for free game items. The document body and embedded URLs suggest a lure for obtaining free game currency or hacks, which is a common social engineering tactic. No scripts were extracted, but the presence of malicious links indicates an attempt to lead the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/479516143/how-to-get-a-free-minecraft-server-game-hack In PDF document text
    • http://gestibrok.com/images/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://gestibrok.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://gestibrok.com/images/coin-master-free-cards_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_off00003411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3411 24296 bytes
SHA-256: 343e87880f223abdedeb11e37491b4293a24e4efef29fe144e4a543c58c12f60
font_01_sfnt_off00006a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A66 17988 bytes
SHA-256: 888c9dccd83fb0c13f9447925305c3d56d9429efcbe621f5ab8e9b5d24de1b14

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