Malicious PDF — malware analysis report

Static analysis result for SHA-256 91136f9a9ab6ac00…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 16:33:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e6525848a0e764b9f62912bd1ece642e SHA-1: 41e07d71e64a07caa7519d986bc72a7f079995a4 SHA-256: 91136f9a9ab6ac00f18d7eef125930abc38376fd40ad8c9b6bc957d974fa8b38
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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
  • 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.xyz/app/431946152/robux-download-game-hack PDF link annotation
    • http://fmbompastor.com.br/images/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/robux-survey_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/coin-master-extra-spins_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://fmbompastor.com.br/images/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/roblox-army-robux_GM431946152.pdfIn PDF document text
    • http://fmbompastor.com.br/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049fe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49FE 25312 bytes
SHA-256: 96f28d11209651b6dd062bb124d91137fe4ed6218307c602f9381002d30a6ca5
font_01_sfnt_off00008391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8391 18656 bytes
SHA-256: 643f530bc401710360b2f74e2e590a7f6ab15445ebda3165faa7e078ea1fa698

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