Malicious PDF — malware analysis report

Static analysis result for SHA-256 81683e697278ff90…

MALICIOUS

PDF

50.4 KB Created: 2020-07-16 05:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b6aa43ba0be95ccc4c0af5aab8daeb3 SHA-1: 15aaf172b265b3a64d4da1b281f102ed942a31c7 SHA-256: 81683e697278ff904ae775f836802c995ebf7e063e503354d824e162925dba20
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of numerous external PDF links suggests an attempt to distribute further content or lead users to malicious sites.

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.com/wb?keyword=les%20eddas%20pdf
    • http://files.rcdavis-tellinstories.com/uploads/1/3/1/3/131383624/ebc2656e5828c5.pdf
    • http://files.genxtraining.ca/uploads/1/3/0/8/130813923/a79feccb70.pdf
    • http://files.createdgainesville.com/uploads/1/3/1/4/131452806/fozumejiv.pdf
    • http://files.soundsofspacetime.org/uploads/1/3/1/4/131437242/fe4db70fe2760.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/letisifujesufapeda.pdf
    • https://cdn.shopify.com/s/files/1/0431/1672/4386/files/27144912378.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0796/files/69238837126.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodowowesibaxen.pdf
    • https://lazekebomita.files.wordpress.com/2020/07/gaxadiporidixifimugi.pdf
    • https://dogazedurut.files.wordpress.com/2020/07/wexijawinipiloralumegoja.pdf
    • https://pasamel.files.wordpress.com/2020/07/23710533872.pdf
    • https://wivutotob.files.wordpress.com/2020/06/13646304194.pdf
    • https://tasomosege.files.wordpress.com/2020/07/36799834501.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/buwujeximamed.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/norojakibi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/51205385164.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53522836856.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/39799526908.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/90781485411.pdf
    • https://cdn.shopify.com/s/files/1/0429/4017/0406/files/57195091612.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008655.bin
c081fa7740287399eb043ef8480975947b6a905d07f177c14d7192cf85be7d3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8655 4292 bytes
font_01_sfnt_off000094e3.bin
10cd9b2a24e9d76b6603922d58240d2f0c3c871a4c4d88ab1d69793c3733d80c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94E3 12348 bytes

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