Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7737986c18af2d6…

MALICIOUS

PDF

43.4 KB Created: 2020-08-31 10:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24e853e5080a58be0ebec0087a51c732 SHA-1: e4e2fda1f08480a81e7bf6df1130751104a5b6fa SHA-256: f7737986c18af2d6caf35c7f81e2f03d242f4f2a066193dd22237422f5fbe83c
154 Risk Score

Malware Insights

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

The PDF file contains embedded URLs, one of which, 'https://ttraff.com/wix?keyword=exercice+de+maths+5eme+avec+correction', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to a math exercise and the malicious URL, suggesting a social engineering lure. The presence of numerous other links to shopify.com, while individually benign, contributes to a link farm pattern, potentially for SEO manipulation or to obscure the malicious destination. No scripts were extracted, but the primary attack vector appears to be the malicious redirector link.

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=exercice+de+maths+5eme+avec+correction
    • https://cdn.shopify.com/s/files/1/0431/2809/4882/files/cox_digital_cable_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/9838/9145/files/kenizolijeniliduke.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/14864796310.pdf
    • https://cdn.shopify.com/s/files/1/0435/7200/2974/files/tevosixodu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1336/6182/files/punogutikunen.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/kuvar.pdf
    • https://cdn.shopify.com/s/files/1/0428/8105/6935/files/86448271840.pdf
    • https://cdn.shopify.com/s/files/1/0437/1418/3323/files/fisicoquimica_castellan_2_edicion_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/putiwor.pdf
    • https://static.usrfiles.com/ugd/f65175_afcf8a6d4a08400cadb3fd816006c31f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ac3c43eabc7466497d2b29eb1063d4c.pdf
    • https://static.usrfiles.com/ugd/60933b_95db2d70384843cc95de33e82a744acb.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f6.bin
0c8a5977633f4b9ef2b02bbe613f17d170f189cf683e6488e10daf5cafcc523e
pdf-font-stream PDF embedded font (sfnt) at offset 0x69F6 5356 bytes
font_01_sfnt_off00007c11.bin
d696c1fb73bef0773b21905c2ca23d54cb38e48dede158e6754e9ae9d756a19a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C11 11172 bytes