Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8bc3624eb2ccdc…

MALICIOUS

PDF

36.8 KB Created: 2021-07-04 12:48:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9d74c903dc1feefe7b195f3fe0843739 SHA-1: 5292fd7135008676408ad51f5aef8e360f70597b SHA-256: 9e8bc3624eb2ccdc8422adfe8153115a376bf570e90b6d87d171e302be3bbb57
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector, designed to trick users into visiting sites offering game hacks. The document body and heuristics indicate a lure for 'Coin Master' and 'Roblox' related cheats, likely leading to further malicious content or scams. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/easy-coin-master-hack-without-verification-game-hack In PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/simplysarc_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/which-stuff-are-free-on-roblox-category_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/do-those-robux-hacks-work_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-free-robux_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-adopt-me-free-vbucks_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-apocalypse-rising-hack-tool_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/free-t-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.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_off00003675.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3675 23580 bytes
SHA-256: b796cb4602ea0e086ae1432d89e57d8d212c26e42aa37f7989848e1b6078f0d0
font_01_sfnt_off00006bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB0 18824 bytes
SHA-256: 880067e4b1b58b0c937db7fabab11e96287663723137378073d452a15a3c54ce

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