Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a9360e24c3369a…

MALICIOUS

PDF

41.1 KB Created: 2020-10-30 21:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ad5b176f378547e4995cb7d3cf3016ee SHA-1: bf5fbc2e62e0797097eb81073d204b9faafc763c SHA-256: 31a9360e24c3369ab5472e9e2ea1d4e609498d08d67633922bc7f23d2dae1b6d
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or redirector services, indicating a link farm designed to lead users to malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

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://cctraff.ru/aws?keyword=evenflo+tribute+lx+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404105/normal_5f9af52b55a0a.pdfIn PDF document text
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/4d2de48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f86f465dd67f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_5f9796a6e20dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5f93ede9f28a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f91afb13707a.pdfIn PDF document text
    • https://xamonato.weebly.com/uploads/1/3/2/8/132814301/xifafuwirojawuko.pdfIn PDF document text
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/zajegekofe_rikozozafutadex.pdfIn PDF document text
    • https://nadazeva.weebly.com/uploads/1/3/4/4/134499610/zofadavumutog_robobelurek_tokejov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_5f89c748f12b0.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/93049f265a0000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/88139190279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/1213/4315/files/24141168185.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/gexuregitifamukawab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7995/7148/files/toy_poodles_for_sale_in_canton_ohio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8694/4692/files/1989_yamaha_virago_250_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9279/5801/files/android_emulator_pokemon_ruby_cheats.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_off0000634b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634B 4960 bytes
SHA-256: 326f18145668c2b2fdd510f33b912178a955796f7955c6eae233e9739a8f92c1
font_01_sfnt_off00007424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7424 10316 bytes
SHA-256: be9749f4336cc89ad8c572c4a1496c1473d7cd96e93e848224a717ccc63f686a

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