Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3c22299c833426…

MALICIOUS

PDF

33.3 KB Created: 2021-07-03 20:55:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fa4c0965e1e72e832d43eaed571259ec SHA-1: ca1e1fb5adcd4296ffd8f8c910e07b1e346d5993 SHA-256: 1d3c22299c8334263ddd9bb2714e2f5129be0a34b4428290f3dd68774df02146
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to known malicious infrastructure, specifically promoting game hacks and free currency generators. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate it's designed as a lure for potentially harmful content. No scripts were extracted, but the primary attack pattern involves social engineering through deceptive links.

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/406889139/coin-master-tiradas-gratis-2021-game-hack In PDF document text
    • http://croatia-flyfishing.com/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/roblox-hack-chrome-web-store_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/rewardrobux-com_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-generator-computer_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/earn-robux-today-earn-robux-today_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/granny-bring-all-item-hack-roblox_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-roblox-gift-cards-april-2021_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/roblox-free-robux-no-verification_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_off00002df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DF0 22008 bytes
SHA-256: bb90eaca1b529edadec213880c941badbdc5a8b3f7693cb1c551384f6b7cadd1
font_01_sfnt_off00005e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E90 18412 bytes
SHA-256: 205f02078e44dc7cbfbb8341c4d4cb1c387440bb67eb4bb631bd87716442abcf

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