Malicious PDF — malware analysis report

Static analysis result for SHA-256 648b150c71bb024c…

MALICIOUS

PDF

39.5 KB Created: 2020-08-31 06:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04694ccef4e3f61bf9caf677a0d191c4 SHA-1: ed6c4f82c96d5e93e237c91fdf73f48650923608 SHA-256: 648b150c71bb024cef64aa5d68dc645d43aeb18558f1800ea6d22b9ae694c22a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of embedded links, with 30 external PDF links detected, suggesting a link farm or SEO manipulation tactic. One of these links, 'https://ttraff.cc/wix?keyword=mathematical+modeling+models+analysi', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious redirector links and the sheer volume of external links indicate a high likelihood of malicious intent, possibly to lead users to further malicious content or phishing sites.

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.cc/wix?keyword=mathematical+modeling+models+analysi
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5323/6902/files/53469089685.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/xogixasa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8682/files/vomijerekunidibapav.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0861/files/12540980033.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/25632602342.pdf
    • https://cdn.shopify.com/s/files/1/0434/8801/8598/files/12357505524.pdf
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/37111270968.pdf
    • https://cdn.shopify.com/s/files/1/0432/1050/6404/files/gizag.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_29c2153b8303443fab20f2dff7fe986e.pdf
    • https://static.usrfiles.com/ugd/b8c837_04cff1fba101469d8086848e1e7b3807.pdf
    • https://static.usrfiles.com/ugd/0e9fc2_060225f3d1d04821946eef06e2878152.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed9871661708467aadf8c849b8467d8d.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/94555971944.pdf
    • https://cdn.shopify.com/s/files/1/0430/6593/3973/files/33449739475.pdf
    • https://cdn.shopify.com/s/files/1/0466/2807/7733/files/lepev.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_off00005b11.bin
ed2364ca040e7365d5a0c9d0f09d0d63b59fea415445f770a677378f0e6d431d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B11 5364 bytes
font_01_sfnt_off00006d3c.bin
65dd998987be518ebd1d6f20b90eaf7475f95730742ce6c55d7e196e488b8278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3C 10552 bytes

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