Malicious PDF — malware analysis report

Static analysis result for SHA-256 b299aefaa236f9d7…

MALICIOUS

PDF

45.1 KB Created: 2020-08-29 14:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bc9c51519bd4eca73e7e81b3cc7277a SHA-1: fe8e4c8038e17a2e9b737fc42d71e162fceffc38 SHA-256: b299aefaa236f9d74591b3ed28f0f0a3b6580e660367ba9a3721f4cf1d00177e
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/wix. Another heuristic indicated a PDF link farm, with many links pointing to static.usrfiles.com. The document body is heavily obfuscated but contains the malicious URL, suggesting a lure to a malicious site.

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=intel%2528r%2529+82865g+graphics+controller+windows+7
    • https://static.usrfiles.com/ugd/b8c837_c40bed4106164791b4c1f9a8b5d2d4de.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_0243f32256204992b7344b95ab021eaa.pdf
    • https://static.usrfiles.com/ugd/097bd5_2aa0ee14c39642ad8a3da097f32fd034.pdf
    • https://static.usrfiles.com/ugd/5bb01c_29f126d6b3dc493e9923818b3a397db6.pdf
    • https://static.usrfiles.com/ugd/b8c837_50fb5fd106654119a8fcc2913c9d35d5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce4c4a72dd684b3d8cac05042bed8cac.pdf
    • https://static.usrfiles.com/ugd/b8c837_5812db5b555941eab2015804c31a046d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5714bae28ead4cc998467ce501fe75ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2ed33a746e141df92f4cf37ceee8fc8.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b75bd4ce4f7415a8768c37507cc0938.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a52d105a9fb4055ab7ab6417f14f8a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b97a473a92f47699ba7965325bf15b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_48f77f2cf4a64f738f36d47e914ca929.pdf
    • https://static.usrfiles.com/ugd/d54300_c5c935ceb96445f2a21d92526b8fef13.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6949/files/bridgewater_associates_daily_observations.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/wevubovuvodatapezififafun.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1038/files/39602423412.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/
    • https://static.usrfiles.com/ugd/b8c837

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006557.bin
e31bf5dad6af6b90e20fd6884800a122f965606c42d451c5b62a874035a1cdb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 6200 bytes
font_01_sfnt_off00007a81.bin
59c7babe87b6a5e4b2564671f0b5afb35e5b04f34b8a9da591f50dfafb2fade8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A81 14124 bytes

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