Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b659d48ccb97f5…

MALICIOUS

PDF

44.9 KB Created: 2021-06-11 10:46:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7e2edb1b5898985d07500d1d4ec8ec0f SHA-1: ca8021ae0e00374bcfa03ddcf4c67e9e908ad070 SHA-256: a6b659d48ccb97f51b77068f3c00124864db3b96014cb11944f347709bb0232d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hacks or generators. The primary link leads to a redirector, and the document also functions as a link farm, pointing to 28 other PDF files hosted on a suspicious domain. The ML classifier strongly indicated maliciousness, and the overall structure suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/email-scammer-claiming-to-be-hacker-in-roblox-game-hack PDF link annotation
    • http://feuerwehr-rheinau.de/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-2021-no-scam_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/www-coinmaster-com_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/hack-de-dinero-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/getrobux-now_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/hacks-on-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-roblox-face-mask_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-free-robux-april-may-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_004_off0000500f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x500F 26280 bytes
SHA-256: dd0df4d6e1286dde628d7718694641e7fe709734fd2c33f6dab3a6d903f336bd
font_01_sfnt_off00008b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B62 18848 bytes
SHA-256: b7c20960b594066bdb03796b76a21f19f38be5ee5c47a9a1526180915c7e058b

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