Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cdba9a1c760f7a…

MALICIOUS

PDF

46.8 KB Created: 2021-06-02 12:45:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 80bb9008c794b9e10bf5b25631382c2b SHA-1: 0c565f1b5ac8832c4d83238518d9040b088ad07d SHA-256: 08cdba9a1c760f7aef3d8cc9f3d0925ae323625bd5df6591a6568fd5f692c42f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which appear to be part of an SEO link farm. The document body and heuristics suggest a lure for free items or hacks, likely to drive traffic to these external sites. The presence of a 'password-protected archive handoff' heuristic indicates a potential attempt to conceal a malicious payload or further malicious activity after the initial download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-premote-group-on-roblox-game-hack PDF link annotation
    • http://zercalo.org/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-do-i-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-gift-cards_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/app-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/no-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://wolfzscriptsIn 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_004_off00004f65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F65 25000 bytes
SHA-256: 737b99327f458ee2313adeefc4039a5e13c9188dac0f7e5ea1e112b29eaba741
font_01_sfnt_off000088e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88E1 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00009291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9291 18784 bytes
SHA-256: 7ae1e8810872aeae5b366acd16ebcb2fc1fa00ab449378e8469d5d83ef9f6c74

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