Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c0899fc6b90a12…

MALICIOUS

PDF

43.1 KB Created: 2021-05-15 16:32:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ccc2ea2b1b36b44770b6798ab11a7026 SHA-1: 166ebeeb2d40a4b38f9698b319c5bdcb4f4196b3 SHA-256: 81c0899fc6b90a12852eb0c87983e75e298e74325ecc241c2d60adb57c883fd8
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 0.9971

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.xyz/app/406889139/coin-master-free-spins-promo-code-game-hack PDF link annotation
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-ios_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-robux-site_GM431946152.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/coin-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://new.man2boyolali.sch.id/__statics/gudangsoal/files/free-robux-no-verification-or-survey-2021_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_003_off00004b01.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B01 25260 bytes
SHA-256: c0b68253ecfa93ee6ca91b16e0a6f7ae77f5228547391a4bb6eaebded00a9f3c
font_01_sfnt_off000085a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85A6 18476 bytes
SHA-256: dc3ef91c42b56b19e880a129857b9cc4209ff723fc15082788877c1745c42c0a

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