Malicious PDF — malware analysis report

Static analysis result for SHA-256 84abc3ea83605bb8…

MALICIOUS

PDF

39.8 KB Created: 2021-06-09 15:46:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0e2e9fe3d38f77a00504d8a47070f7a6 SHA-1: ae393431c2664eca0fbd40e51085f4ed211fefae SHA-256: 84abc3ea83605bb8fa7030b06d92595e966d9af97b43fbf7831141804c81f5c3
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks and generators. The primary lure URL is https://netcdn.tw/app/431946152/how-do-have-a-speed-hack-in-robux-simulator-roblox-game-hack. The document also hosts a large number of links to other PDFs, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the embedded links are sufficient to classify this as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/how-do-have-a-speed-hack-in-robux-simulator-roblox-game-hack In PDF document text
    • https://i-photo7.com/image/data/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/coin-master-free-chest-link_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/minecraft-beta-free_GM479516143.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/ezy-roblox-hacks-download_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/install-coin-master_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005088.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5088 25592 bytes
SHA-256: 1572ccfa04a786b17899ffbba4628afc2cbafbd594924babe75fc416585a357b

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