Malicious PDF — malware analysis report

Static analysis result for SHA-256 4373b8b27f117148…

MALICIOUS

PDF

34.4 KB Created: 2020-11-02 00:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ecc81d2c92f5d0de8d3edc9fb8ab649a SHA-1: 05257939bcb639244c54856caa0444baa3dc9c3b SHA-256: 4373b8b27f117148d4601cc7a1fee8b16322db6119d0cf3475a2ee3588354eec
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many pointing to disposable hosting services, characteristic of a link farm. One of these links, https://ttraff.me/123?keyword=jamsen+s+fish+market+and+bakery+copper+harbor, is flagged as a known malicious redirector. This suggests the document's primary purpose is to lure users to malicious or potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.me/123?keyword=jamsen+s+fish+market+and+bakery+copper+harbor In PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/bbf4380.pdfIn PDF document text
    • https://mukaxonalox.weebly.com/uploads/1/3/4/5/134580963/2041984.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/tuvesowovoviju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5f9be3517e299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_5f9ed6ee5a6a3.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/fesesosobo-wafofomatajimet-nigujalozimala-sipenop.pdfIn PDF document text
    • https://galuxenezinex.weebly.com/uploads/1/3/4/4/134437763/187506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5f99777b0ac53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_5f91274a23841.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/3914/3062/files/lugiluluvetoxorerotinu.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/aar_manual_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/23183715100.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4849 5660 bytes
SHA-256: 1130c0085d94a234f632f05fe64e9a086a248e21dc9165cda54be9e6c88db519
font_01_sfnt_off00005b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B6E 9716 bytes
SHA-256: b0590be904c91dedf0e5eaa35c26e5fed321bf212c9fe017e0976713d1587a0e