Malicious PDF — malware analysis report

Static analysis result for SHA-256 6045f52012c83706…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 07:51:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5330b24dcb2585a76815ee8a22ea0b49 SHA-1: 5890d65258296d1d9f7a18b125508d7d2f8da71d SHA-256: 6045f52012c83706ae7b97c82d277ec668b123b423fa8cc9f7ec3c04891b7e7b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics suggest a lure related to 'free generator / game hack' content, aiming to trick users into clicking these links. The extensive list of external PDF links indicates a potential SEO manipulation or link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/how-to-get-1-million-robux-for-free-2021-game-hack In PDF document text
    • https://tecturatw.com/image/data/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/roblox-com-r_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/simplysarc_GM479516143.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/cpbildco-robux_GM431946152.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/freespinandcoin_GM406889139.pdfIn PDF document text
    • https://tecturatw.com/image/data/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • https://collectrobux.coIn 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
stream_004_off0000523a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x523A 25336 bytes
SHA-256: 27923aa81eb9487188903ab2a7f1d98dbae19906a506c563112dab7aea2efac2
font_01_sfnt_off00008d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2B 19072 bytes
SHA-256: 6899649986c08cd88da4e8ab8a55ee52e34bf21c69bba097983649bb28a6798f

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