Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f655de654291f4e…

MALICIOUS

PDF

42.1 KB Created: 2021-05-15 17:00:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c6b7a879e30cc04fd6bd8c8a6f8c3d21 SHA-1: 498a0c1dba62e8626c81bf529364e2265f1dbeae SHA-256: 2f655de654291f4eb7a1f7a246d09bc3ad89290270fbdb719e2827f67b6ed0f8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, including one that redirects to known malicious infrastructure, masquerading as a 'free generator / game hack'. The document body and embedded links are designed to lure users into clicking these malicious URLs, likely leading to further compromise. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/479516143/free-minecraft-java-edition-account-game-hack In PDF document text
    • https://www.hobbypcb.com/images/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.hobbypcb.com/images/xray-hack_GM479516143.pdfIn PDF document text
    • https://www.hobbypcb.com/images/free-robux-pin-codes_GM431946152.pdfIn PDF document text
    • https://www.hobbypcb.com/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.hobbypcb.com/images/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • https://www.hobbypcb.com/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.hobbypcb.com/images/ear-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.hobbypcb.com/images/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.hobbypcb.com/images/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • https://www.hobbypcb.com/images/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://www.hobbypcb.com/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://www.hobbypcb.com/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.hobbypcb.com/images/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.hobbypcb.com/images/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://www.hobbypcb.com/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://www.hobbypcb.com/images/coin-master-code-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.hobbypcb.com/images/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.hobbypcb.com/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.hobbypcb.com/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://www.hobbypcb.com/images/free-robux-kid-friendly_GM431946152.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_off0000488e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x488E 25132 bytes
SHA-256: 053e5905b15bce92198fa976b1f7862fefc6123ee12b2aafb2cdf87b2a8c3e9e
font_01_sfnt_off00008222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8222 18304 bytes
SHA-256: fdb32e200e3f48b15bca95ad0d9adda07d4e6a4b6e210c555ad24f5d4abffe5e

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