Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de2adfa155b39c9…

MALICIOUS

PDF

37.0 KB Created: 2020-08-02 19:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc59ec1559ee0add04ef4bc8d58272c3 SHA-1: bb2826cdf5a79ff537d156b51f98937384b11d16 SHA-256: 5de2adfa155b39c9c4bce5f85229d2cd18ecbfde2253642da2b20c7078385254
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=rule+34+beerus'. The document body, though heavily obfuscated, also contains this URL and numerous other PDF links, suggesting a link farm or redirection tactic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of malicious links indicates an attempt to redirect users to harmful content.

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=rule+34+beerus
    • http://files.twfermco.com/uploads/1/3/0/9/130969061/8768062.pdf
    • http://files.melbournegallbladdercentre.com.au/uploads/1/3/1/3/131382274/paxetifupekiz-vunimibutaviju.pdf
    • http://files.spreeaad.com/uploads/1/3/1/4/131408942/genagobanomef-jimuwu-vulixuwakuwapo.pdf
    • http://files.doctasoftware.com/uploads/1/3/0/7/130775247/7399642.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/43394324698.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2497/files/xujadetix.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/vanilla_wow_cooking_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5676/files/77223206324.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1534434062.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/12945645927.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/bexokeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5229/files/rebavorodatazugopukotosu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/check_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/14764953004.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/68645286279.pdf
    • https://cdn.shopify.com/s/files/1/0434/3808/0166/files/62671363494.pdf
    • https://cdn.shopify.com/s/files/1/0435/7849/1041/files/51940999691.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_off0000566c.bin
0921ac7f05a93bf6eec8738933b8465a16744dcecc2fb414ed127f04640584fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x566C 4868 bytes
font_01_sfnt_off00006717.bin
610b8c11e52d199acd3076b5612b7d4a8e715cd1a2054eeb57e0eb0033ddea43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6717 9456 bytes

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