Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f629636c24523bf…

MALICIOUS

PDF

47.2 KB Created: 2020-08-30 03:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f89f52effddb8c6ac95bf59d4e2e6dd SHA-1: 1d98064009ed65fee9c8e486fd03f48a28fdbca2 SHA-256: 6f629636c24523bf7f860d9b4073672e7fee460fc29532b60ed806c2387f2acf
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com, disguised as phonics worksheets. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that is also present in the heuristics, suggesting a lure to download or view further 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.com/wix?keyword=phonics+worksheets+pdf+grade+2
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1409/5001/files/1221866873.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/77692525830.pdf
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/fujilere.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/54020249455.pdf
    • https://cdn.shopify.com/s/files/1/0435/9018/9215/files/tijamolalanofofoxidep.pdf
    • https://cdn.shopify.com/s/files/1/0435/2783/1712/files/35531952268.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gasowezigubufavowi.pdf
    • https://static.usrfiles.com/ugd/2813e2_3c72aa5c43ae48319ed8465c7b067ff8.pdf
    • https://static.usrfiles.com/ugd/a467d2_9c1cd79c960149058e0454418578b5d4.pdf
    • https://static.usrfiles.com/ugd/0df15e_c51fc9953cdd4b3d81751e39c55e421f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce054c7d533441bb908d312701f67b71.pdf
    • https://static.usrfiles.com/ugd/b8c837_a55c3657c1c346ceb08a8fe36e0100b7.pdf
    • https://static.usrfiles.com/ugd/0dd040_89a1d415efd74c96accede8af304420a.pdf
    • https://static.usrfiles.com/ugd/affaa6_191ab887059f498091bc55c7cb022145.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_off00006c86.bin
31bc5e4c33d965cbcb44b03f064b8fd7f6d062409b18c9810d61277f8ce0a6e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C86 5464 bytes
font_01_sfnt_off00007f1c.bin
f125b15226c73567c7f0bec528701bbc5cd378093a7c602620f0a15f306bd8c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F1C 10128 bytes
font_02_sfnt_off0000a1d0.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D0 4324 bytes