Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcf84a11ef7e138…

MALICIOUS

PDF

42.5 KB Created: 2021-05-11 21:38:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 553b179639b5fbac69d12d9c6567e55a SHA-1: 8c85d1b03834d3dd7e6eb5ef696ede1e2734a8f6 SHA-256: 6dcf84a11ef7e138ce89c133dec3ecab206a3ad51a8586c99c8cce5dfb20174b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, including a primary link to a site offering 'robux' for Roblox, identified as a malicious redirector. It also features a large number of links to other PDFs hosted on occquimica.com.br, suggesting a link farm designed to manipulate search engine results. The document body, though partially corrupted, contains references to game hacks and URLs, reinforcing the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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/how-to-get-robux-on-roblox-game-hack In PDF document text
    • http://www.occquimica.com.br/images/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.occquimica.com.br/images/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.occquimica.com.br/images/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.occquimica.com.br/images/clean-master-hack-coins_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://www.occquimica.com.br/images/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://www.occquimica.com.br/images/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://www.occquimica.com.br/images/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/coin-master-heaven-links_GM406889139.pdfIn PDF document text
    • http://www.occquimica.com.br/images/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.occquimica.com.br/images/free-spin-link-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_003_off000046f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46F3 26732 bytes
SHA-256: abc28e311b73b1f2dd6b802de27a06596d5840eea764c7d9c71c32b69ea6dbb3
font_01_sfnt_off000083fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83FD 18192 bytes
SHA-256: 6f80236451fc1e14c638224e970cc30e723993c5fccbf8a9b83dbf32d3a654d7

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