Malicious PDF — malware analysis report

Static analysis result for SHA-256 83340a26c031ced6…

MALICIOUS

PDF

39.0 KB Created: 2020-08-29 17:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7f9b7864e58481632bc2133d183e9f0 SHA-1: c631d522f82673930e1f090b7927adb39c14a37a SHA-256: 83340a26c031ced63abba47e4f19ef6ad309951bc4ef32092a1c20342f986635
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL. This suggests the primary goal is to redirect the user to malicious infrastructure.

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=used+horizon+e900+elliptical
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/pebaxonum.pdf
    • https://cdn.shopify.com/s/files/1/0435/2435/8298/files/area_of_triangle_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/68903141076.pdf
    • https://cdn.shopify.com/s/files/1/0435/2314/5896/files/fufazotuvujazapo.pdf
    • https://static.usrfiles.com/ugd/b8c837_29b0faa7fe7f46a59861ac64290e4320.pdf
    • https://static.usrfiles.com/ugd/b8c837_758a16ec0518498996994908b41602d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_022441e0a6994c79b7f1fd4cfe042bb1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad74b0de7d444d92bd1906a93270d4a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_a38d6fa4cb47484080ed3b800154c22e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1779f72805b5484d8595fa4a2d796370.pdf
    • https://static.usrfiles.com/ugd/b8c837_dce6b614c31746b3a4c9b72b73c21fbc.pdf
    • https://static.usrfiles.com/ugd/b8c837_eeb7b8ec05764115b8b8a780d8230f3b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1043eb328fd84f3d80d6d986ea97281e.pdf
    • https://cdn.shopify.com/s/files/1/0428/6870/3398/files/a_level_biology_past_papers.pdf
    • https://cdn.shopify.com/s/files/1/0433/5013/0846/files/mediaget_android.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_off00005814.bin
30c61aa6da04be1289be28354bd75e5c292c676e097775a26458332a26e50222
pdf-font-stream PDF embedded font (sfnt) at offset 0x5814 5500 bytes
font_01_sfnt_off00006ac0.bin
4a63ea91e36ede7129be431d412774f6e4a437502800585ad07a1accfbdf6b7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC0 10752 bytes