Malicious PDF — malware analysis report

Static analysis result for SHA-256 33136124e9101dec…

MALICIOUS

PDF

44.2 KB Created: 2021-06-11 11:44:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 51b92b2c5805322986da233f2a555459 SHA-1: 17f2cb99594a84059fa450621b4caaeb39eca79c SHA-256: 33136124e9101dec4e7d4933399aaaca42ed8c5e4166b0d3f20a76b98cb181e7
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • 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/roblox-fe-hack-game-hack PDF link annotation
    • http://katalog.ireyogya.org/repository/2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-free-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/level-coin_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/admin-command-for-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-make-your-game-really-popular-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/pokemon-go-no-free-box_GM1094591345.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://collectrobuxIn 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_off00004e76.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E76 26120 bytes
SHA-256: 40c23a975d528a24bf785f1f942e3900ad8a9a9dfb30265d4ebe4785d3b46eb7
font_01_sfnt_off00008a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0B 18344 bytes
SHA-256: 554e876d23f3a2dde9be625c5dae397f87ebd7f4265f3d18fb06909685708753

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