Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba42f059cb1e0f9…

MALICIOUS

PDF

43.2 KB Created: 2021-05-14 13:26:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2de43d3514396a05fe03141c2e42e03e SHA-1: 707d806644fd2fc79f96f3f38d516e21bb9acdca SHA-256: 1ba42f059cb1e0f91e23bd974ae5b780db5766b7cabf214dccc577fac5854475
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links and a link farm, specifically targeting users with lures for game hacks and free generators. The primary malicious URL identified is https://netcdn.xyz/app/431946152/rblx-city-free-robux-game-hack, which is presented as a 'free Robux game hack'. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://netcdn.xyz/app/431946152/rblx-city-free-robux-game-hack In PDF document text
    • http://www.bripi.pl/images/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://www.bripi.pl/images/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.bripi.pl/images/coin-master-free-spins-link-today-new-2021_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_003_off0000495e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x495E 26712 bytes
SHA-256: 90f5cea095d739f41c3e1b59e900c766dd9b1b1732366b4b8ec4f45f0e1069cd
font_01_sfnt_off000085f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85F6 18492 bytes
SHA-256: 8c36c54b235ee774b4288e3a660071bec0b4f54d4ae0ca28de0be66b92090129

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