Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b524df95b9f3c17…

MALICIOUS

PDF

50.7 KB Created: 2020-08-30 12:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d0a87539b5a56ad43445cebcc58f0c8 SHA-1: f3404a893886ca1f4da3412024ca0012228aac26 SHA-256: 6b524df95b9f3c17fbc106671a8f1e4037a7214e71590990d3bcd372ad139a87
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains this URL and numerous other links to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. 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.com/wix?keyword=device+mapping%253A+no+known+devices
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/lawaratoko.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/dufonajirezog.pdf
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/xovepebetuwa.pdf
    • https://cdn.shopify.com/s/files/1/0440/9812/5976/files/fjallraven_uk_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/sql_injection_tutorial_in_urdu.pdf
    • https://static.usrfiles.com/ugd/b8c837_50199653541b47a692d79a1b27ef0e76.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_ff134290b32349e4acd022dfa8d76d4e.pdf
    • https://static.usrfiles.com/ugd/136d07_270714ef9bbc47a68d097c580e3ce87e.pdf
    • https://cdn.shopify.com/s/files/1/0432/7034/0772/files/mesifibakogo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/23981529178.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6807/files/nmr_spectroscopy_table_for_functional_groups.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1702/files/shrimad_bhagavad_geeta_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/63962518935.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_off0000690b.bin
3803725069cef9481379181340868a229bfdbefc8d6aab17453bfafb886da84c
pdf-font-stream PDF embedded font (sfnt) at offset 0x690B 4624 bytes
font_01_sfnt_off00007947.bin
cfb43a458fb1f47cb9b3b77a2b21b40f282495acf55210da326e8c7d2e9ac861
pdf-font-stream PDF embedded font (sfnt) at offset 0x7947 5564 bytes
font_02_sfnt_off00008c48.bin
0da36c81267a16eb412f505a54543358387df36df04aa2b2b87d7e3929a2b02a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C48 15800 bytes