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) First seen: 2020-09-24
MD5: 5b6aa43ba0be95ccc4c0af5aab8daeb3 SHA-1: 15aaf172b265b3a64d4da1b281f102ed942a31c7 SHA-256: 81683e697278ff904ae775f836802c995ebf7e063e503354d824e162925dba20
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, with a primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. The presence of numerous external links, many pointing to Shopify-hosted PDFs, suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 In PDF document text
    • http://files.rcdavis-tellinstories.com/uploads/1/3/1/3/131383624/ebc2656e5828c5.pdfIn PDF document text
    • http://files.genxtraining.ca/uploads/1/3/0/8/130813923/a79feccb70.pdfIn PDF document text
    • http://files.createdgainesville.com/uploads/1/3/1/4/131452806/fozumejiv.pdfIn PDF document text
    • http://files.soundsofspacetime.org/uploads/1/3/1/4/131437242/fe4db70fe2760.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/letisifujesufapeda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1672/4386/files/27144912378.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5000/0796/files/69238837126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xodowowesibaxen.pdfIn PDF document text
    • https://lazekebomita.files.wordpress.com/2020/07/gaxadiporidixifimugi.pdfIn PDF document text
    • https://dogazedurut.files.wordpress.com/2020/07/wexijawinipiloralumegoja.pdfIn PDF document text
    • https://pasamel.files.wordpress.com/2020/07/23710533872.pdfIn PDF document text
    • https://wivutotob.files.wordpress.com/2020/06/13646304194.pdfIn PDF document text
    • https://tasomosege.files.wordpress.com/2020/07/36799834501.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/buwujeximamed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/norojakibi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/51205385164.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53522836856.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/39799526908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/90781485411.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4017/0406/files/57195091612.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8655 4292 bytes
SHA-256: c081fa7740287399eb043ef8480975947b6a905d07f177c14d7192cf85be7d3e
font_01_sfnt_off000094e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94E3 12348 bytes
SHA-256: 10cd9b2a24e9d76b6603922d58240d2f0c3c871a4c4d88ab1d69793c3733d80c