Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86ee88348e3013e…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 10:39:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3227a5a5de7df8b4e315f6bce65d43b9 SHA-1: 52982d2efbe021e52d64fc47a74467f97d10766a SHA-256: c86ee88348e3013eb6b15e1a71bd72b119271091dcba70d4bb2a016d40e7edbc
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appear to be game hacks or generators. These links redirect to malicious infrastructure, specifically identified as a known malicious redirector. The document body, though partially obfuscated, contains text related to 'Free Robux' and 'Game Hack', reinforcing the lure. The presence of numerous links to external PDFs, many with numeric slugs, suggests a link farm intended to manipulate search engine results for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/free-robux-without-human-verification-game-hack In PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/minecraft-free-download_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-facebook-free-spins_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/minecraft-hacker-skin_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/where-can-i-get-free-spins-for-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_off00005105.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5105 27968 bytes
SHA-256: 837d4e16e0aa318d56a0126b7533dd56939aaa3231421e81ed7ba042daa3a6d0
font_01_sfnt_off00009110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9110 19224 bytes
SHA-256: 69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399

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