Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b6fff31ae7fda9…

MALICIOUS

PDF

34.8 KB Created: 2020-07-10 14:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36c295e6a66dff9b89fc10322924963e SHA-1: 6cf6e5520ec73c70280e6900a53f4e0deedd7469 SHA-256: d5b6fff31ae7fda9006f8b9ded9bfe5f90b10545478564092e670dd8a12e2f7b
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous embedded URLs, with the primary one being `https://ttraff.com/pify?keyword=piscicultura+ecologica+pdf`, which likely serves as a redirector to malicious content. The presence of a large number of external links suggests an attempt to distribute malware or conduct phishing attacks.

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/pify?keyword=piscicultura+ecologica+pdf
    • http://files.extreme-food.eu/uploads/1/3/2/7/132712505/xemijonab.pdf
    • http://files.rockphenoms.com/uploads/1/3/0/7/130739039/6794770.pdf
    • http://files.stuffweallwant.com/uploads/1/3/2/7/132740384/54c49b573.pdf
    • http://files.mrshulburd.com/uploads/1/3/1/3/131379940/2027616.pdf
    • http://files.dirittoesocieta.org/uploads/1/3/1/3/131383982/lazuge_xanilorax_valizir.pdf
    • http://files.themoveablechurch.org/uploads/1/3/0/8/130874128/9175303.pdf
    • http://files.ailantha.com/uploads/1/3/2/8/132814473/jolajoso.pdf
    • https://mexiduv.files.wordpress.com/2020/06/93282737993.pdf
    • https://nonasagiji.files.wordpress.com/2020/06/16543182814.pdf
    • https://juwurel.files.wordpress.com/2020/07/kilarexisakakolox.pdf
    • https://vefejavu.files.wordpress.com/2020/07/98702035751.pdf
    • https://defawepunago322067097.files.wordpress.com/2020/07/82922685946.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73633131036.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xorufolikuvuzinekotawoxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/tijugerosaxejizole.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/10752743061.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53635556436.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jenodilibaxu.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_off00004c10.bin
fb48002972700fbfe77f20c205fd872eeb7384a0e387ceb1ad257d1865b36439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C10 5100 bytes
font_01_sfnt_off00005d77.bin
1169afab5cf283517a565f66e4436c857885021cc22c4cccd0d8891eafb8cc93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D77 10108 bytes

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