Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d177288fd5ce28…

MALICIOUS

PDF

40.6 KB Created: 2020-08-09 03:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b91e951429e74114817c7439e9c06c47 SHA-1: 32323ac943f754206f2544cfc7b254a947857824 SHA-256: 15d177288fd5ce2865968b7053d0c5cf301d982818e245ac8aa1e2b30faa6d88
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'architectural patterns book pdf' and the malicious URL, suggesting a lure to generate traffic or distribute further content. The ML classifier 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.com/pify?keyword=architectural+patterns+book+pdf
    • http://files.pqassessments.com/uploads/1/3/1/0/131071082/fasanusexipux.pdf
    • http://files.koreamedicaltour.co/uploads/1/3/1/4/131408344/kurupezafiz.pdf
    • http://files.hillsofnotts.com/uploads/1/3/1/3/131398367/8326653.pdf
    • http://files.shellybroughtonart.com/uploads/1/3/1/4/131453086/gemuz_kipizog_fasogaluwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/fevivubopuwep.pdf
    • https://cdn.shopify.com/s/files/1/0433/6739/9575/files/i_roll_for_shoes.pdf
    • https://cdn.shopify.com/s/files/1/0436/1755/0499/files/nafowezuxevipix.pdf
    • https://cdn.shopify.com/s/files/1/0435/4415/0165/files/sofudidofufuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/30661606939.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8369/files/public_finance_management_system.pdf
    • https://cdn.shopify.com/s/files/1/0432/7076/6750/files/92940560562.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/riziregalexikabeg.pdf
    • https://cdn.shopify.com/s/files/1/0439/8107/8686/files/css_drop_shadow.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/62695693850.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/78113713052.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/dafel.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9109/files/spinning_color_wheel.pdf
    • https://cdn.shopify.com/s/files/1/0434/1645/3272/files/zepoferuxenikibesatabujek.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_off0000610a.bin
94ecca2202e160259c94f3ca466d77e6eed9a5593704aa451f7bfe1201f324f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x610A 5436 bytes
font_01_sfnt_off00007376.bin
8614d96dbc4604faa67176fa12447309572bef2518644778b3d17c67449d0a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7376 9816 bytes

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