Malicious PDF — malware analysis report

Static analysis result for SHA-256 055d6da6f579d690…

MALICIOUS

PDF

50.2 KB Created: 2021-06-09 08:42:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 34a96f53705a37e2cde9cbeb010fb83b SHA-1: 0c4f52a4a8fbe0074bb658018d37627166bab25d SHA-256: 055d6da6f579d690d74f132297ad5a3ffe61d1b28e56ecf77c72d99541ec6e63
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document acts as a link farm, directing users to various websites that promise game hacks and free currency, such as 'free-roblox-gift-card-20219-game-hack'. The document contains numerous external links, many of which are SEO-optimized to appear as legitimate resources but lead to further scam pages. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or scam campaign designed to drive traffic to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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-gift-card-20219-game-hack PDF link annotation
    • http://feuerwehr-rheinau.de/images/how-to-use-a-cheat-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/real-robux_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/is-minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-daily-spins-from-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_004_off000050f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F8 33864 bytes
SHA-256: b38123043668290708d8db1cc4f2e5e1089b018c82afa39e99afbf3f779574ab
font_01_sfnt_off00009f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F53 19140 bytes
SHA-256: 3d7ae1689cb8f27b2195d461b28f859fc13ab6d660e709bff51ac155d281051f

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