Malicious PDF — malware analysis report

Static analysis result for SHA-256 3710abe34b0e6758…

MALICIOUS

PDF

35.9 KB Created: 2020-08-29 20:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09f1b6baec94c2886b59eff65835f653 SHA-1: da8047364d401d05efb1b936eb4bdc375e9459f0 SHA-256: 3710abe34b0e6758acff1288e6063dbbbe44d1eb55f3ccfc0125de984792e271
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits a PDF link farm, with numerous embedded URLs pointing to external resources. One of the primary URLs identified is 'https://ttraff.com/wix?keyword=karuna+kontha+malayalam', which is associated with malicious redirector activity. The document body contains obfuscated text and a reference to the same malicious URL, suggesting a lure or redirection mechanism.

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=karuna+kontha+malayalam
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/lawawotugag.pdf
    • https://cdn.shopify.com/s/files/1/0454/1726/7368/files/classified_advertisement_format_cbse_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/73386162674.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/dokinagen.pdf
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/automatismo_industriales.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/ilrn_heinle_log_in.pdf
    • https://cdn.shopify.com/s/files/1/0437/1152/9114/files/tiwofivij.pdf
    • https://cdn.shopify.com/s/files/1/0451/2422/3141/files/cub_cadet_owners_manuel.pdf
    • https://static.usrfiles.com/ugd/dd4472_407cc51a1d8241ae951316bc58ef233a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2a0d872d3a7454e8ce9df9342e8e8b0.pdf
    • https://static.usrfiles.com/ugd/cc03df_0cfdec6e35fc4fe2904eb7eb3dc402c2.pdf
    • https://static.usrfiles.com/ugd/97634b_84e63a3159914878a384b2f034b0495d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6fbb7c673101445893d7852fea85c092.pdf
    • https://static.usrfiles.com/ugd/60933b_b2464221165446f9b2d52b9d618c2444.pdf
    • https://static.usrfiles.com/ugd/b8c837_90e518543667433cbb1d34ab83fc318a.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd4d65ea4f9444d2a5a347f9902067be.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffb9a4596e70430c8c666932c403267b.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/
    • https://static.usrfiles.com/ugd/b8c837_ffb9a4596e70430c8c6

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004525.bin
f770e1b6d2672207b3f644150a0135d63f26bd6d36cc7ca31d090dc9215ce09b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4525 4600 bytes
font_01_sfnt_off0000548e.bin
641da51c5110d6e4c52d569f24f786a9af0f72fb7ec7ea43951eed5d3cfae312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x548E 9368 bytes
font_02_sfnt_off00007497.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7497 4324 bytes

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