Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddce05032a42ee7…

MALICIOUS

PDF

35.5 KB Created: 2021-07-06 04:40:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6451000e2d26204cb8d37f13f87f9cf3 SHA-1: 51b213cccc235e01cc758ba12e61701edbec1063 SHA-256: 7ddce05032a42ee781611857565d1735ea3ee80f8b2483ea04eae4a4dcfc01e7
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/406889139/coin-master-free-spins-link-no-verification-2021-game-hack PDF link annotation
    • http://opac.salatiga.go.id/slims7/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-how-to-get-free-robux-without-hacking_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-free-robux-on-ipad-2021_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/gamekit-800-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-free-coins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/huskey-how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-vip-for-hammer-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-cheats-how-to-get-free-stuff_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/download-roblox-for-free-unlockable_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/proxy-hack-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/hack-using-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/roblox-you-are-kicked-from-this-game-do-not-cheat_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-obama-t-shirt-roblox_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_off00003205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3205 23128 bytes
SHA-256: da05e6cc21b2a650316e176f7607377023b7edbaa2d2be2ef9a40ebb3a206bb6
font_01_sfnt_off00006635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6635 18880 bytes
SHA-256: 959a402348cf5c915c560357ecab6e8019ade4de046d620f98c663afb78237ce

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