Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f8e2fc0b16a3ae…

MALICIOUS

PDF

44.9 KB Created: 2021-05-12 14:03:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: eb5e944e366a6a21d575e38ba1a0cb1a SHA-1: d4271981be137ff11e66ae090120594a5b718c12 SHA-256: 56f8e2fc0b16a3aee570227667d12d03ba1c036d851f53cf62681e1fb4261028
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, masquerading as a "free generator / game hack". The primary lure is the promise of free Robux or game hacks, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious redirector chain designed to lead users to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • 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.
  • 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/free-robux-with-no-verification-2021-game-hack In PDF document text
    • http://zercalo.org/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-key-free-spin_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/freespincoin-masterlinkdownload_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-cracked-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/teach-me-to-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.bandicam.comIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000044d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x44D7 25392 bytes
SHA-256: f77d9df80db327e55aaa22391bcf2ba3107b0cf42fe0195828f05b42b4a0f709
font_01_sfnt_off00007fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FAD 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8998 19368 bytes
SHA-256: aac922b8691acc9aa277dffee065f580c863b50a75d1a5b8a64d6db85e21622d

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