Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11872700e502379…

MALICIOUS

PDF

33.3 KB Created: 2020-08-30 12:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df5ff3723be83d9c1a5d603637fa9b82 SHA-1: f541b5782878c32788ff332745995344db6e29e9 SHA-256: a11872700e502379a880ff35fe482829ea5444e0ed1ca79dbff3abb493d41d04
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.ru/wix?keyword=essentials+of+psychology+4th+edition
    • https://cdn.shopify.com/s/files/1/0438/4355/1392/files/porimeropirijurab.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/bukarulukozigusabopefij.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/citizenship_definition.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_d3d2d3c3e3db4fd5846aa73a1540e198.pdf
    • https://static.usrfiles.com/ugd/79e5df_e1676b940efb4c468fb4983610bd2e84.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeff4ba2c74d4a128f8b9975cb84a643.pdf
    • https://static.usrfiles.com/ugd/0d002d_8ae4afccf1dc40adb739dd2fe89e0b82.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e95fec18a414b6698e1d9e79c1d23d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc3391f897ee4cf0892fdb4e1ae6a8be.pdf
    • https://static.usrfiles.com/ugd/12f4eb_45e13195d1364fe180d44bef6c3f9589.pdf
    • https://static.usrfiles.com/ugd/c7a620_c0968f1013f64476a7d5c60fd7047cf6.pdf
    • https://static.usrfiles.com/ugd/b8c837_0afb0f52b8904898960e2504f864322e.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_off0000439a.bin
b994e8afd9ea03ab74111badbf3cbc4b4c1c00da2dfa0069145f4d47656a3829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x439A 5468 bytes
font_01_sfnt_off00005642.bin
4093b9360acaaa8767c8ff57d4c7acf58b143d27d879ff61adff58b852b2764d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5642 10184 bytes

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