Malicious PDF — malware analysis report

Static analysis result for SHA-256 716b6d2db07b583f…

MALICIOUS

PDF

36.1 KB Created: 2020-08-21 18:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ca0f08be1bf5c58949d3763adc698d5 SHA-1: f4dffa07eecafbc8ef6ac921c14e89c61568f536 SHA-256: 716b6d2db07b583f7e13cc6e7d0a81547c06f516d1d5b4cda608c9d65ace0175
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 identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains URLs that are likely part of a link farm or SEO spam campaign, aiming to direct 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.ru/pify?keyword=bal+ganesh+video
    • http://files.rayleonardjr.com/uploads/1/3/1/3/131379280/wiwepejomosilow.pdf
    • http://giguj.reyburnactivities.com/uploads/1/3/1/6/131606505/gevefazefana-xurik.pdf
    • http://bakuvop.decorativedetails.co.uk/uploads/1/3/2/3/132302780/4781955.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9569/5268/files/95838499883.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/agriculture_books_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/lugizuvisapizudixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/nisijakabasebagejiguzolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5549/files/texonegof.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/kowuvovanuluseluxewejopog.pdf
    • https://cdn.shopify.com/s/files/1/0430/9050/9973/files/roveropoxidofupokajesaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/3444/2908/files/ncert_biology_class_11_short_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/brokeback_mountain_proulx.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0431/4516/7008/files/78875015363.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_off00005045.bin
4fd3acd5ddd2ceeb550227b41d9de87b0d2b8c727317eaa817a60e63d75ea230
pdf-font-stream PDF embedded font (sfnt) at offset 0x5045 5100 bytes
font_01_sfnt_off0000619c.bin
e9cf4c91039aff03c6ed65b6aa0717d90c14eaea8cf541ee7b79490ccb5d4c4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x619C 10024 bytes