Malicious PDF — malware analysis report

Static analysis result for SHA-256 a08b049d98ded5ab…

MALICIOUS

PDF

46.4 KB Created: 2021-06-08 23:05:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 01b2e5ea7f2799f6e106c89391efd200 SHA-1: abb9c2ac77ff17df2c112eb7cd5c9e024614d862 SHA-256: a08b049d98ded5abff076cfdb295127ca64616b4dedfea66158933c64b1ecd3d
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 0.9832

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/free-roblox-sound-effects-game-hack PDF link annotation
    • http://opac.salatiga.go.id/slims7//repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-birthday-glitch_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-coins-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/coin-master-free-spins-and-free-coins_GM406889139.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/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7//repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/how-to-hack-roblox-infinite-robux_GM431946152.pdfIn PDF document text
    • http://opac.salatiga.go.id/slims7/repository/report-abuse-roblox-pastebin-free-robux-code_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_004_off0000520e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x520E 28172 bytes
SHA-256: 579b4d313b11b620eb0f0e5dc2ad6981b24dc1b9004c8adfc93a49ad5eb1899f
font_01_sfnt_off000092c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92C5 18368 bytes
SHA-256: 5fa5f4f1fd53f1c58e1f63425ef2f0b8f448252bd363fabdaf756318fdc406b9

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