Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6b3a0d492fdc53…

MALICIOUS

PDF

46.2 KB Created: 2021-05-11 22:31:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ee1633c963e9254e9c84a655f997cf9f SHA-1: 928cb2b0e47075ca7cf68cdba1295d231d0ace51 SHA-256: ca6b3a0d492fdc5307ded4fdab8407307f134a1ee755e65c7ae5ef2f40fc241e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux hacks' and similar game-related scams. The primary lure is a link to 'netcdn.xyz', which is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting potentially harmful sites. The document body, though partially corrupted, contains text related to 'free Robux' and the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

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-hack-no-human-verification-game-hack In PDF document text
    • https://pneukalousek.cz/images/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-map_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-support_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/corn-master_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • https://pneukalousek.cz/images/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-spin-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-robux-link_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/roblox-hair-for-free_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/how-to-get-spins-for-free-on-coin-master_GM406889139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c72.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C72 25620 bytes
SHA-256: 5c45bb070c5c577bab7aa711490c11e43bb5077ed90510b226d20425b07948fc
font_01_sfnt_off0000860f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860F 2852 bytes
SHA-256: 75e243850a88f7f23bac019afe59063315618031fd802617cf35ebe7d1c3a71b
font_02_sfnt_off00008fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDB 19028 bytes
SHA-256: 768a4e91d7c3975acc2b79a699acb909e0f8bbf2befa87684aa1b4f9aecc197e

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