Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae411f1d26654b7…

MALICIOUS

PDF

33.7 KB Created: 2020-08-06 22:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 174c8d8f5d5e09ff0127334c2c212f24 SHA-1: 69343dae166b3a93db3741abe87b3fca6223f9d1 SHA-256: 7ae411f1d26654b72c2d9b88dcec527e7beb159ddb12f819b8c40bb404b95736
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=disney+piano+duets+sheet+music+pdf'. It also contains a large number of external PDF links, suggesting a link farm or SEO spamming technique. The document body, though heavily obfuscated, contains references to the same malicious URL and benign-looking Shopify URLs, likely to disguise the malicious intent. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest a phishing or redirection attack.

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.cc/pify?keyword=disney+piano+duets+sheet+music+pdf
    • http://files.tomhall.org.uk/uploads/1/3/1/3/131379343/rudaletamowoxu.pdf
    • http://files.findabrick.uk/uploads/1/3/1/3/131383754/golevuxufurovu.pdf
    • http://files.greenwillonline.com/uploads/1/3/0/7/130775655/7246023.pdf
    • http://jibukila.pirateerrecords.com/uploads/1/3/1/4/131438759/817ae1.pdf
    • http://files.recycledgranitenashville.com/uploads/1/3/1/3/131380915/donit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/48799765319.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/kubijubulipago.pdf
    • https://cdn.shopify.com/s/files/1/0434/9450/6661/files/92081679180.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6925/files/69499303685.pdf
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/47844441704.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/xuzogorobuzeno.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/vinubovuko.pdf
    • https://cdn.shopify.com/s/files/1/0439/7599/9646/files/flora_bacteriana_normal_de_la_boca.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xazijejizamoketabuguta.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/96943657049.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/pragmatic_competence_definition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/divur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/nerevuvovovupivedat.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_off00004757.bin
46051b34e953053117383423836fac346c25cdbbc2ccc904a2cc07631a0f13ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4757 5368 bytes
font_01_sfnt_off00005989.bin
1be80b4aa1e551ce2e9c3f77bfc726ec7779e778d3de61411caa9b93b86130ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5989 9464 bytes

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