Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36a54c4b90a8112…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 06:52:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 24dfb2f15e552507b586420290122a72 SHA-1: 221824b890b6d7e1c41c4dafcc3a247f60b88c9d SHA-256: b36a54c4b90a81125aa18c4eb597c0eb6e951bdbb6c8caca58575e312b67deb2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, that lure users with promises of free game currency or hacks. The primary malicious link, http://netcdn.tw/app/431946152/huskybuscom-free-robux-game-hack, is designed to lead users to potentially harmful content. No scripts were extracted, but the presence of malicious redirectors and the lure content strongly suggest a phishing or scam attempt.

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/huskybuscom-free-robux-game-hack In PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-no-download-2021_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/how-t-get-free-robux-2021-site-youtubecom_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-hack-robux-hack-com_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/free-spin-coin_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-roblox-and-get-free-stuff-2021_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/robux-gift-card-hack_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-be-vip-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-2021-inspect-element_GM431946152.pdfIn PDF document text
    • https://math.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-hack-facebook_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_off00002fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBB 21824 bytes
SHA-256: cedd0db4f290b2265cd6914adb8330a4969813fa1927b04b7b48a30a6feb5200
font_01_sfnt_off00005ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF6 19324 bytes
SHA-256: fa71a02eff7d38361fd0194e941a22015f12e2817721f9ddba48d3de862e217b

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