Malicious PDF — malware analysis report

Static analysis result for SHA-256 548e7d59d8e2fc33…

MALICIOUS

PDF

44.9 KB Created: 2020-10-16 06:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a0187dfd70442a21ac72fa97d0c6fca0 SHA-1: 3a2bfe00dcf17634530e7725f7eac60fbfbb4f2b SHA-256: 548e7d59d8e2fc330ee2949a4556f8d8dc01efd64ba92b73dd63e76e758add67
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document structure and link distribution suggest it's part of a link farm designed to manipulate search engine results or direct users to malicious sites. The ML classifier also strongly indicated maliciousness.

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://ggtraff.ru/123?keyword=pes+2020+android+offline In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f874ae48967b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f8881ee2cdef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f87272f84053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f88bdf367062.pdfIn PDF document text
    • https://site-1048265.mozfiles.com/files/1048265/8444536841.pdfIn PDF document text
    • https://site-1048530.mozfiles.com/files/1048530/89135985262.pdfIn PDF document text
    • https://site-1043239.mozfiles.com/files/1043239/xutanebutezizuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f88a588ea28a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f88a5532f1af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5f88ff0969d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f88b6d570525.pdfIn PDF document text
    • https://site-1043791.mozfiles.com/files/1043791/zekomiposusoxuvafedap.pdfIn PDF document text
    • https://site-1037906.mozfiles.com/files/1037906/86505469476.pdfIn PDF document text
    • https://site-1041483.mozfiles.com/files/1041483/kuxokejazeberus.pdfIn PDF document text
    • https://site-1039197.mozfiles.com/files/1039197/dugisev.pdfIn PDF document text
    • https://site-1041301.mozfiles.com/files/1041301/numivewemifewituvuselazus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f874ab022df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f88a0374678a.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/1/0485/9271/5941/files/41148098628.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0153/4873/files/gumomivigaloxin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6147/6504/files/the_final_earth_2_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/2310/7749/files/97765771065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0488/9760/files/99588640639.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_off00007296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7296 5176 bytes
SHA-256: 2ad936be452c271a343753e0466bdc71ec023b5ba7402589256dfe33f9717ba7
font_01_sfnt_off00008432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8432 9920 bytes
SHA-256: 8f610cb0137743a184ee443bc9e611f0c34326cbf24c15b585f3d5401816ce7a