Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ff5098f30b5497…

MALICIOUS

PDF

46.4 KB Created: 2021-06-07 10:51:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 195bad89f76ed8e413811a344e2bd3f2 SHA-1: 9c1ddce1c34e480a499fddc2e857c6ff0af955f4 SHA-256: f7ff5098f30b549714822079148bf65843d5cc6dff29bd9e892d945a5073d90b
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links, many of which are part of a link farm designed to improve search engine rankings for scam-related terms like 'free Robux' and 'game hack'. The primary lure impersonates Facebook and directs users to a URL that does not match the impersonated brand, indicating a credential phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links suggest exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/free-ll-robux-game-hack.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-ll-robux-game-hack PDF link annotation
    • https://vieclamjapan.com/upload/files/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/code-free-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/robux-miner_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/xray-mod-minecraft-114_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/lots-of-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/offers-for-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-www-com_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/what-is-exploiting-in-roblox_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005202.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5202 24216 bytes
SHA-256: 105e4edf3f9e0b6adeba0ec5e857473f181a35492c6be736e0a5c400dc1e7111
font_01_sfnt_off00008948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8948 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000092f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F8 18088 bytes
SHA-256: 7d03e5eacedc2307102f98a9aa83bba865e4626979d600705f02926ff8cdf163

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