Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43f09c21437d04b…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 05:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0166efa06a138e8d90690ac2af1e4585 SHA-1: 370039399863141f7bdcdd4c6057109e69011e53 SHA-256: f43f09c21437d04b2898b857f1e8c539eeaef9cfb7e5aad355fadcda49329bd6
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that matches the primary malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted from this sample.

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=ciencias+3+quimica+secundaria+fundam
    • https://static.usrfiles.com/ugd/b8c837_75d5d82399a74aec98401ac42c2378e0.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_c72cd927127b452a87d5a80d6fa9c10c.pdf
    • https://static.usrfiles.com/ugd/455f95_2557b89923b1441590c7d41d761ff714.pdf
    • https://static.usrfiles.com/ugd/79e5df_7cbf85a1f0e84392869a5a9553f14679.pdf
    • https://static.usrfiles.com/ugd/ed64d2_1c2700bf8a7a4146a9cdfef80b505a91.pdf
    • https://cdn.shopify.com/s/files/1/0436/3000/2336/files/begavejewipigugunerofu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2204/7656/files/jedapiralete.pdf
    • https://cdn.shopify.com/s/files/1/0435/3225/5392/files/zenagizapokinijaxanes.pdf
    • https://static.usrfiles.com/ugd/565485_3ff86da47cf5433b867c1d1f6ebbd617.pdf
    • https://static.usrfiles.com/ugd/b8c837_9103ccc0c81647c68040e4b2ae5c9f27.pdf
    • https://static.usrfiles.com/ugd/a4d998_64c453f97f3746e6a696c80712c9b558.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_361b2e28d78b446393df241cc384c6cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88d3958e0544203acd54e37eeedbea4.pdf
    • https://static.usrfiles.com/ugd/23b571_47dc74a77ae34c0da27ff053ff625131.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_off00006451.bin
cfb5e1013d728f9cd55a42f3b34b545b363fbef610fc237d642b12476803332b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6451 5332 bytes
font_01_sfnt_off0000764a.bin
88afd81e7a173ef18a758983a5d213e4005addf8e2d464cd566da0e9dd6d72df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764A 12176 bytes

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