Malicious PDF — malware analysis report

Static analysis result for SHA-256 f245ddad1ce17a3f…

MALICIOUS

PDF

35.6 KB Created: 2020-08-29 17:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9d59d7ed92050dca2b3603ea3e7848d SHA-1: 4fb46b6843210ca8b730f8636b1c2c4f9989954b SHA-256: f245ddad1ce17a3f58ac3c0f4ea5752a66fb2eb20904380c828fd8f15cd048b8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text related to 'Pj mask coloring pages' and the malicious URL. The primary attack vector appears to be luring the user to a malicious redirector via a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.link/wix?keyword=pj+mask+coloring+pages
    • https://static.usrfiles.com/ugd/ce14f3_91b1fb81a9e14444bb1023190104064e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce2eb99890cb4ec88b7d458bb6da8de4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4402322f5fa04236b3d0c8e7f7e9091b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2385d517cd24c5f8a47f9ca32f2eb64.pdf
    • https://cdn.shopify.com/s/files/1/0435/2091/7668/files/turamixuzinivegepasezosad.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8727/files/pufoxufovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8986/files/ketutabikesoresevo.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a5e9668ea7844e390bd419b5f506d85.pdf
    • https://static.usrfiles.com/ugd/93c935_d22ed10da00145a3b220da41eec20d52.pdf
    • https://static.usrfiles.com/ugd/0d002d_2345f36ea3224ad68647eb8edff9e54a.pdf
    • https://static.usrfiles.com/ugd/b8c837_7cd13c792f7b4ae3b8f5829fde2e64d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_c125e6a495d149299d5f7e858dc8e264.pdf
    • https://static.usrfiles.com/ugd/b8c837_c773afb0a1c040b3abcb07471c7f7c08.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_a5ce47052a9a46e888a055cd5b7d7282.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_2c0db41f2c1e4639b47d56e6ca1af44c.pdf
    • https://static.usrfiles.com/ugd/b8c837_73da8329b14d4ff7b43e116734a409de.pdf
    • https://static.usrfiles.com/ugd/b8c837_28e03144634b43e495604f5e37795879.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e39.bin
52056a1858179b4b8ff3e34fc632598213daa961efdc2baedca8aec9d73f97da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E39 5396 bytes
font_01_sfnt_off0000607e.bin
e84ad2d77d754316e8e5b885301be295ea8cf87898ef9e5cf01e0aaecb764a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 9596 bytes

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