Malicious PDF — malware analysis report

Static analysis result for SHA-256 6127e2cd5b87f3d8…

MALICIOUS

PDF

56.8 KB Created: 2020-07-31 05:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 360675f379eee96121b589cfb743ed1c SHA-1: 950d77e0adfaa403461e1e27ab235b8bcaf92bd7 SHA-256: 6127e2cd5b87f3d8b21a377f64fdbe508d355859dbcdfbf9d4e2f8247de875d7
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm infrastructure designed to obscure the final destination. One of the primary links directs to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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=bridal+march+piano+sheet+music+pdf
    • http://files.bradscoachingacademy.com/uploads/1/3/1/3/131383318/sewokovuginewazekok.pdf
    • http://files.barehandscrossfit.com/uploads/1/3/1/4/131453982/359124.pdf
    • http://files.summitventure.co/uploads/1/3/0/7/130739076/wewejufelinujij.pdf
    • http://files.88jamz.com/uploads/1/3/2/6/132683000/8e5fc6a5b8cd2ce.pdf
    • http://files.whatcomexcavator.org/uploads/1/3/0/7/130775286/mavatokizidaxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0436/2888/8227/files/kodukidulisexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1099/7921/files/89682045988.pdf
    • https://cdn.shopify.com/s/files/1/0433/0569/7438/files/suwonutafubeliropituwoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8584/0036/files/51476599538.pdf
    • https://cdn.shopify.com/s/files/1/0439/0499/1400/files/80995931817.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/zoxefegevadovix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55166802931.pdf
    • https://cdn.shopify.com/s/files/1/0430/1606/1091/files/66208230734.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jegatakufiritejat.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/laberegamumozavapotonixo.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/sakis.pdf
    • https://cdn.shopify.com/s/files/1/0429/6622/0956/files/wurelupalase.pdf
    • https://cdn.shopify.com/s/files/1/0438/8706/7291/files/35736227733.pdf
    • https://cdn.shopify.com/s/files/1/0433/7618/1400/files/metunixunebaredoruderuw.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074c8.bin
6476f80c5a3ba9523b23c17cff5cf4da04014e97f00d81f20c719060b0a5c2c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74C8 5324 bytes
font_01_sfnt_off000086ac.bin
a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86AC 3720 bytes
font_02_sfnt_off0000920c.bin
bc641252f84ed791d881c3b815e6c6577dcb6326ec2fc9b5a6f40c92aec60291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x920C 10152 bytes
font_03_sfnt_off0000b4c3.bin
8e8f8959f1dc8a157b5a6a387dd47d2b8d3e0b4979fad59b4f99aaf41148ec4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C3 10044 bytes

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