Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5692e8194f4c98…

MALICIOUS

PDF

38.4 KB Created: 2020-08-23 07:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cc07cde2d3fc133061351961d0de810 SHA-1: a74dca9ff3e416cf71c187ab2e6080fd849b69d5 SHA-256: 6a5692e8194f4c98e0a6333c980882b8ac727bcc17c4ec1cd686f726874e3098
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same malicious URL and a benign-looking URL, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs and the nature of the redirector indicate an attempt to lead the user to a malicious site, likely for phishing or to download further malware.

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/pify?keyword=desi+desi+na+bolya+kar++dj
    • http://files.gemscene.com/uploads/1/3/2/7/132712333/5866538.pdf
    • http://nupovi.allendaleunionchapel.com/uploads/1/3/1/3/131384306/lazodenop-betuxivesemosax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/algorithms_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0439/6908/5598/files/16284683834.pdf
    • https://cdn.shopify.com/s/files/1/0438/2556/1757/files/knowledge_encyclopedia_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/bronx_zoo_map.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/sudabonaveravikezap.pdf
    • https://cdn.shopify.com/s/files/1/0439/3671/0824/files/best_android_phones_2019_cheap.pdf
    • https://cdn.shopify.com/s/files/1/0450/4076/3030/files/code_alarm_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0432/1184/files/30551339290.pdf
    • https://cdn.shopify.com/s/files/1/0440/2118/6718/files/tivetelodi.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_off0000501a.bin
f458c4e32e71fc04ed6159c2128fa73ca6d9f5d75b2d098d2f36106e17f6ddf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x501A 5200 bytes
font_01_sfnt_off000061e0.bin
904c5cd0796e66037fade117b5d3cb95b623d95ade4b1ded9d93ac226ae8bd07
pdf-font-stream PDF embedded font (sfnt) at offset 0x61E0 13468 bytes