Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff62acb19972209…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 00:37:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a00d5b6f2b72e9fdda062806febad944 SHA-1: 1ecc720dfb424d8322f232dd143fe2aec5b6032e SHA-256: 7ff62acb19972209176a3386c2e54d6bcdc831d69a8125a63d9e769b279b148f
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 0.9980

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 http://netcdn.tw/app/431946152/free-robux-codes-game-hack PDF link annotation
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/free-robux-no-human-verify-or-download_GM431946152.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-robux-2021_GM431946152.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/roblox-free-obby_GM431946152.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/how-to-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/roblox-obby-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://elearning.manlimapuluhkota.sch.id/__statics/gudangsoal/files/free-roblox-card-codes_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
stream_002_off00003171.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3171 22436 bytes
SHA-256: 5a00584b547748f1fa69fd8f6acde02384e1ddfcc98e44e36c1c00d0b5c6cddd
font_01_sfnt_off0000638d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x638D 18888 bytes
SHA-256: 0b210ae1d2f25d9b8ac974921f9fa88679103a832855b836aa7747c7a59cf8bc

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