Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a4073ec10eb824…

MALICIOUS

PDF

48.5 KB Created: 2020-08-20 21:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0597a53433182abeb383b8bec16f6d20 SHA-1: d457725bd9ea95b3443f609001fa67b5419b8cec SHA-256: 89a4073ec10eb824a0ba74a7c531005c2921bcc7412bd1a1606b01434701c54b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to malicious infrastructure, disguised with a lure related to 'best offline android games with great graphics'. The PDF also functions as a link farm, pointing to numerous other PDFs hosted on Shopify, likely for SEO manipulation or to spread further malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=best+offline+android+games+with+great+graphics
    • http://files.thegoldpatrol.com/uploads/1/3/1/4/131453114/xasedafogajazija.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0445/3623/4148/files/android_studio_disable_auto_import.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/torowowuxeveb.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6857/files/dilamirixeje.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/58871800000.pdf
    • https://cdn.shopify.com/s/files/1/0436/7053/6345/files/52717790509.pdf
    • https://cdn.shopify.com/s/files/1/0432/5595/5619/files/manos_que_curan_barbara_ann_brennan.pdf
    • https://cdn.shopify.com/s/files/1/0437/5727/3237/files/magivasujamofomepeneb.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_off00007e9c.bin
b9395b443276f27b3b31f44f3ef54822daeaf2c5feffb54d907c720e81f65f72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9C 5712 bytes
font_01_sfnt_off000091e8.bin
ffda0eb2ddf94f47120843bc268ace25278c4bd3ea03ea28ea9a28441f41860d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E8 10328 bytes

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