Malicious PDF — malware analysis report

Static analysis result for SHA-256 656e286152ec8a02…

MALICIOUS

PDF

67.5 KB Created: 2020-09-01 07:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e5ea46d941721e3b074c1c8258a1a15 SHA-1: f355f257cf693f14a5bfd769c8e25cd28d3e7f8c SHA-256: 656e286152ec8a0283729b254db5a7c40a7e7d1e8d1ff5745712e083cf5e94b1
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.link'. It also exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to redirect the user to potentially harmful content.

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.link/wix?keyword=karnofsky+performance+scale+score
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9058/2435/files/how_to_generate_battery_report_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/dabajilupi.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/79838727029.pdf
    • https://static.usrfiles.com/ugd/6c032c_62027a0df28941e5be3a6fef24f0297c.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_71f83b1cd64c437b9f99671574b6f852.pdf
    • https://cdn.shopify.com/s/files/1/0428/6719/6063/files/40297880905.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/fallout_76_fire_breathers_knowledge_exam_answers.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_7c7c604dd6674d04baa38907aa7d9958.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_c64e7a653e414c84aac0d8bbb7a79bbd.pdf
    • https://static.usrfiles.com/ugd/6f53d7_1162cf211150419f834f077e385df7ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_5eb25f9902e447c89147184e0b68948f.pdf
    • https://static.usrfiles.com/ugd/b8c837_791fd0c048c3440aaea525b831fe53db.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_off0000c5f3.bin
dc35b87f574b98e1f0b60ccdf5ea2a8cea04c2cdf3b0d73f0afc03140c34593d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F3 5296 bytes
font_01_sfnt_off0000d7f4.bin
34145da73168b15156566d0ecb1f585fef49bbcc3c89e8b5ae114f7f275c9c92
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 12628 bytes