Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3ded9ac1988f2d…

MALICIOUS

PDF

41.6 KB Created: 2020-09-17 14:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ac072c8ef7f65a3d80ccba63ac2ea2 SHA-1: f0f53a91146b9d7aaa5629254f7052b60b747300 SHA-256: 8c3ded9ac1988f2db2dec864059f4b047bc945b4d77c50f667640ec9b64bdb9d
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with at least one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains references to URLs that are also present in the embedded link farm. The primary attack pattern appears to be luring users to malicious sites through a link farm.

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.link/wix?keyword=apwh+period+5+map+test
    • http://waruroxa.travelingsauna.com/uploads/1/3/1/3/131379877/c98b0.pdf
    • http://mujevez.karencougan.com/uploads/1/3/1/6/131637291/fevavuwu.pdf
    • http://files.swarschaw.com/uploads/1/3/1/3/131398591/4770384.pdf
    • https://a8d34b60-ad4a-4b70-a81e-de353868ce4d.filesusr.com/ugd/5e81b9_1ee2712e475844e4a3b812a5065f566c.pdf?index=true
    • https://ba0d1e03-ce52-4b4f-8aec-7a656d07f774.filesusr.com/ugd/a6e5e9_8cbff5fe7b3945c89a907db2bba36b03.pdf?index=true
    • https://522a37b9-80e8-43e0-87fc-e75aecc322a6.filesusr.com/ugd/031dda_cb66a9c0cc184c88bc0d1572ac7347e6.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/9011/5748/files/65906020855.pdf
    • https://cdn.shopify.com/s/files/1/0429/1526/6713/files/20044239669.pdf
    • https://cdn.shopify.com/s/files/1/0481/9517/4557/files/waveguide_attenuation_vs_frequency.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/aghori_hd_video_songs.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_off000062c2.bin
7593a904563e3e0a3ac45f6f3186b40e2b83f7f8748e406b30eaa82639d60346		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C2 5372 bytes
font_01_sfnt_off000074ea.bin
74f96436a713ffdb18c2437ef202e48f6a8cb63360f0ac6d90da8008b06799bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EA 10520 bytes

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