Malicious PDF — malware analysis report

Static analysis result for SHA-256 86eac194bcfd67cc…

MALICIOUS

PDF

36.1 KB Created: 2021-07-05 23:06:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5581f7ea67a9c186cb984be081738bad SHA-1: cc5815195ec4f41f498bf6e1ffd24ab0ee36f3ce SHA-256: 86eac194bcfd67cccce8bf481268065855e0cb27630755783ec682aa0349c8b9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are SEO-optimized pages promoting game hacks and cheats. The primary URL, http://netcdn.tw/app/406889139/coin-master-hack-unlimited-spins-and-coins-cheats-game-hack, is directly associated with a game hack lure. The heuristic findings indicate a link farm designed to redirect users, and the ML classifier strongly suggests malicious intent. While no scripts were explicitly extracted, the nature of the links and the document's content point towards a social engineering attack aiming to trick users into downloading malicious payloads or visiting phishing sites.

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-hack-unlimited-spins-and-coins-cheats-game-hack PDF link annotation
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-hack-roblox-bop-it_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-gainer-free_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-free-valk-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/ghost-walk-hack-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/games-to-get-you-free-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/galaxywqlfroblox-hack_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-hack-on-murder-mystery-2-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-in-peoples-roblox-account-without-hacking_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-lego-hack-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/play-roblox-theobbypros123-acount-for-free_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-sites-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_002_off00003334.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3334 23608 bytes
SHA-256: da65ed824ee53670e74d73699571ab02c4038ede304d21ea0889c9b146f449f4
font_01_sfnt_off0000687a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x687A 19040 bytes
SHA-256: 39bb62ba45ddd9235cb8b6510e81746704a0223c79b1bd75ccd0ed540052c21d

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