Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31cafc18cd2cb86…

MALICIOUS

PDF

49.8 KB Created: 2021-06-11 03:46:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 611eea973d5a8648633bb83f0c27f640 SHA-1: 0dbb78e88907caf5c0aef034201203ad512c58ee SHA-256: a31cafc18cd2cb86ba7fd9eabf814982c98a0a881e0d0fa01f03a25939bcc2f7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9796

Heuristics 4

  • 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/back-free-items-roblox-game-hack PDF link annotation
    • http://chem.ipb.ac.id/kim/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-can-you-get-free-robux-on-your-phone_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-today-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-any-gamepass-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/how-to-get-free-money-on-roblox-adopt-me_GM431946152.pdfIn PDF document text
    • http://chem.ipb.ac.id/kim/repository/free-robux-by-watching-ads_GM431946152.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_off00005528.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5528 26804 bytes
SHA-256: 9482a72b2cb7bd8f7823c5773645b5563b800eb0bbb6168bcf7ea07d9672fa9e
font_01_sfnt_off0000934c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x934C 3500 bytes
SHA-256: e49a868379cd3c37e631c5a53c010e21f38d803532a2b8417aee82315d4e8634
font_02_sfnt_off00009eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EEE 18708 bytes
SHA-256: 6676e21a264108af1011cc1b4e5b47d2333e2bbe65b61d05840feb96af471914

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