Malicious PDF — malware analysis report

Static analysis result for SHA-256 15eb4619915b4eb6…

MALICIOUS

PDF

57.4 KB Created: 2020-08-05 01:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa05d6036ba7fc8d72ced1c4c3f20436 SHA-1: 4094da2f689805873dfaebddbed34f89584d3d1c SHA-256: 15eb4619915b4eb6b3f75afd54d169bd58f4087bb74d961990c5ac4fd3649a1e
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a pattern of linking to external content, likely to obscure the final malicious destination. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect the user to a malicious site, potentially for phishing or further payload delivery.

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=el+neoliberalismo+en+m%25C3%25A9xico+pdf
    • http://files.designsbydebllc.com/uploads/1/3/1/3/131380308/3202943.pdf
    • http://files.debbiemilnerlively.com/uploads/1/3/2/8/132813998/xubimusanixigol-savefope-rufojaba-mexipub.pdf
    • http://files.potentialgamestudio.com/uploads/1/3/0/8/130815014/xeputob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/6851/3686/files/nikoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/2219428056.pdf
    • https://cdn.shopify.com/s/files/1/0427/8288/4006/files/9547887332.pdf
    • https://cdn.shopify.com/s/files/1/0437/6995/4456/files/34326607389.pdf
    • https://cdn.shopify.com/s/files/1/0437/6523/5866/files/hailstone_sequence_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/61863005395.pdf
    • https://cdn.shopify.com/s/files/1/0432/4818/9603/files/zumilu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1805/files/narine.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/27282915620.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/synonym_for_write.pdf
    • https://cdn.shopify.com/s/files/1/0431/9815/2866/files/29933225995.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/60909450159.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000902c.bin
ecb5349ad9fef72497394379660e28089be76f1950710c4a20905056104e4571		 pdf-font-stream PDF embedded font (sfnt) at offset 0x902C 5316 bytes
font_01_sfnt_off0000a1c8.bin
33dbafb7377f8fe02789798515cdd771319dbf36cb8bd2dc87f921497432d761		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C8 11840 bytes
font_02_sfnt_off0000c823.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 4324 bytes

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