Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdae28c5063c64a3…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 18:01:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 23cb532261f62e0e4366e2e0cdf43f4b SHA-1: 15001d69942eb0828f230d96daa4715db3b7c818 SHA-256: cdae28c5063c64a327d9ba6afb6011347cb65b1f8decb68d85833faec3a2d1f3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "free Robux" and "game hacks" as a lure. The primary malicious URL identified is http://netcdn.tw/app/431946152/free-robux-without-survey-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

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-without-survey-game-hack In PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/suicideboys-hack-slash-roblox-id_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/is-robux-free_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/is-tiktok-free-on-ipad_GM835599320.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-robux-hack-on-android_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-spins-coin-master-site-wwwquoracom_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/hack-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/how-to-hack-someone-robloxs-account_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/free-coin_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/roblox-legendary-swords-rpg-level-hack_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/is-minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/how-to-get-robux-free-no-verification_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/pubg-uc-zong_GM1330123889.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://www.mondecasa.com/Public/upload/editorfiles/coin-master-free-cards-link-2021_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_off00002ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED6 22472 bytes
SHA-256: 6add6f83d4e22a8139da8ff0de8afb1ea6c0de626f7d6d370c1bcf0b5fc1189f
font_01_sfnt_off000060a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A6 19600 bytes
SHA-256: ea618dc0ac89057573f0900fc77451ab5142be89e827617cc4892c329dfdb229

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