Malicious PDF — malware analysis report

Static analysis result for SHA-256 5733a5e4a80f6049…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 02:04:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4173a293fd8d3c519b9cc539a4370085 SHA-1: 43e0db4134ecf2e9804099401616ae371f51336d SHA-256: 5733a5e4a80f60491124e46169e3f157f13a3cc1533646edab0de30437db91d4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a lure for game-related cheats and accounts, linking to known malicious redirectors and a large number of SEO-optimized PDF files. The document body explicitly contains the lure text and directs users to the malicious URL http://netcdn.tw/app/431946152/free-roblox-accounts-2021-with-robux-game-hack. The presence of embedded URLs and the nature of the content strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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-roblox-accounts-2021-with-robux-game-hack In PDF document text
    • https://i-photo7.com/image/data/files/free-robux-promo-codes-february-2021_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/free-robux-lmao_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/free-draw-alpha-roblox_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/how-to-hack-field-of-battle-roblox_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/free-roblox-adopt-me-bucks-cheat_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/roblox-sword-free_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/roblox-player-download-2021-free_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/roblox-prison-life-hack-script_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/300-roblox-accounts-free-v34m_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/best-free-roblox-skins_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/tiktok-free-view-iphone-wallpaper_GM835599320.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://i-photo7.com/image/data/files/free-spins-in-coin-master-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_off00002fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA8 22380 bytes
SHA-256: 4168ff8880f50273c1f9b999ff20311e640127df4afd6fe1864adc48b7a356c2
font_01_sfnt_off00006132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6132 19780 bytes
SHA-256: a55470c357d6117f87c66cfcc5dd60461d5ad292bd735cfee1ec5bb843310ba7

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