Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e81d0aef941340…

MALICIOUS

PDF

34.1 KB Created: 2021-06-25 11:27:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 40d7feacad7c7215495d544bfad21de7 SHA-1: e068b9f8aad04a6482d6f767d5f265f5ae0b6b53 SHA-256: c7e81d0aef9413408cdf7e6e8953c8f3edb417980c93af64583a501af257cac4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple links to redirector infrastructure and other PDF files, masquerading as game hacks and free currency generators. The primary lure is the URL http://netcdn.co/app/431946152/minecraft-noob-vs-pro-vs-hacker-vs-noob-roblox-game-hack, which is flagged as a malicious redirector. While no scripts were explicitly extracted, the document's structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via 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.co/app/431946152/minecraft-noob-vs-pro-vs-hacker-vs-noob-roblox-game-hack In PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-hack-no-verification-on-ipad_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-html-adfly_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-spins_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-blank-roblox-shirt-templates_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/roblox-lua-executor-hack_GM431946152.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • https://ciptawiratirta.com/assets/CKImages/files/huskybuckscom-free-robux_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_off00002ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF0 21872 bytes
SHA-256: 953f7e01c21e4d125352c04108816666a64d7420628fe00a96318597a6f3d7d7
font_01_sfnt_off00005f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F41 19364 bytes
SHA-256: f4cd635b74c9cc11e19e9a39fe8e1c9e51ecb331d2a51d47eae968b58f4c4c36