Malicious PDF — malware analysis report

Static analysis result for SHA-256 2077cb8529920c68…

MALICIOUS

PDF

49.8 KB Created: 2021-06-04 00:43:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e901c59cd570dc4753f132b46e733690 SHA-1: 5a4fb897f6703d90cc6603e9aab0bbabcbe6b1e3 SHA-256: 2077cb8529920c6839a7a2f1164ea7edca2680da4b8a76f0a3b307db10d5287f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links to external websites, many of which appear to be part of a link farm designed to attract users searching for game hacks and generators. The primary lure is for 'Robux' and 'Coin Master' cheats, directing users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous embedded URIs suggest a phishing or redirection attempt, likely to deliver a second-stage payload or lead to a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/robux-no-human-verification-game-hack PDF link annotation
    • http://perpus.stikesphi.ac.id/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/pokemon-go-free-kanto-ticket_GM1094591345.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051ea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51EA 28016 bytes
SHA-256: 4d7f2f558f5df5f164923966ca949601cb04b30d44747daead6f0740186e9d77
font_01_sfnt_off00009224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9224 3884 bytes
SHA-256: 64ea6bfd232c3abde76d8b86727203bfa3f935a5783cd0c1f642cf6d3fb42b29
font_02_sfnt_off00009ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECC 18696 bytes
SHA-256: b0b7efb10b2be72ca1f11f5058a16b7f706f868f5fc2e7590f71e4c885e22b6d

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