Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4b4b37a1786430…

MALICIOUS

PDF

44.1 KB Created: 2020-09-20 12:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecc507fdedcc8e8f109f6e683278af0f SHA-1: e977f0aa7ae94ac3d41e65a7bff9121df316b703 SHA-256: 1f4b4b37a1786430824f0d8465279a296588d592e960a4993fd007ce3152f5f2
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to embedded links pointing to known malicious redirector infrastructure. The document body contains garbled text but also includes the URL 'https://ttraff.club/wix?keyword=hitchhiker%2527s+guide+to+the+galaxy+earth+computer', which is identified as a malicious redirector. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content broadly. The file's creation by wkhtmltopdf indicates it may have been generated programmatically.

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.club/wix?keyword=hitchhiker%2527s+guide+to+the+galaxy+earth+computer
    • http://watososa.samarbetsbolaget.com/uploads/1/3/1/3/131380485/puxuliraxetijivid.pdf
    • http://kenug.affordabletherapytoronto.com/uploads/1/3/2/7/132740836/vowaxowemipaku-leruvibuzegi.pdf
    • http://files.mthomesandland.com/uploads/1/3/2/6/132681264/3495588.pdf
    • http://sitijema.greenhaughprimaryschool.co.uk/uploads/1/3/0/8/130874320/gilofobiga-lepuriwofex.pdf
    • https://6f065d4a-79da-4ad4-84f8-933d0804f3ae.filesusr.com/ugd/5aec95_72393ba94611484396f52b58c1948263.pdf?index=true
    • https://407ca7d9-10b3-4d9d-a150-49a7a3c732bc.filesusr.com/ugd/9a242c_a5386d984f194695b3d1cbba61555212.pdf?index=true
    • https://8325795c-8464-4909-9ef4-97f28b7f7ca6.filesusr.com/ugd/01e791_637cdc68e54c4ccd84025c3b9ef75a2e.pdf?index=true
    • https://c51ac610-e374-4361-9c85-fcfc0ac8f1eb.filesusr.com/ugd/cd81e9_7553b9e8bd844d958cc0df00bc7895d1.pdf?index=true
    • https://7952c21d-19e2-4980-a180-d888deb084d1.filesusr.com/ugd/b916f4_41700c7152b6453199f2680e9348c0fb.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ginowojero.pdf
    • https://cdn.shopify.com/s/files/1/0435/2009/8472/files/ponosirovuja.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d1a.bin
84e80a49402cd49ca9dec7ffd0a1a7aeb396f6190775c401060373b08c43ee9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1A 5492 bytes
font_01_sfnt_off00006fd8.bin
e95392686cc5ce2787d7ac65f64e70f3e6cb166bda15c85fd4011e4b2518ed06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD8 10464 bytes
font_02_sfnt_off000093a8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93A8 4324 bytes

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