Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa1b50f01d19234…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 23:45:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3637a07ab1d900713cdb46759f3d5dc7 SHA-1: 306b494cd4253a529d1f00f3f0051241f79673ae SHA-256: ffa1b50f01d19234c9f083cb33f832a04b445ce2f1d495072dfa20974040b31a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and redirectors. The document body explicitly mentions 'free Robux' and 'game hack', indicating a lure for users seeking in-game advantages. The presence of multiple redirector links and a link farm suggests this PDF is part of a campaign to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

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/how-to-get-free-robux-website-game-hack In PDF document text
    • http://thamelinn.com/userfiles/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/roblox-prison-life-free-swat_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/blockland-for-free-robux_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/pokemon-go-free-and-home_GM1094591345.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/roblox-rules_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/roblox-hide-and-seek-cheat_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/tiktok-follower-bot-free_GM835599320.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://thamelinn.com/userfiles/files/free-robux-real-working_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_off00002ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC9 21792 bytes
SHA-256: 2711f65e6019f5d545b4e49c28638645f19709c97126d899ff9c14ad27d301a7
font_01_sfnt_off00005eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAC 19304 bytes
SHA-256: c93debd830b422eae21ec10a608c2d09d6fed7207bb4c45cee900aa0b721bbbd

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