Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee5b8d841e39358…

MALICIOUS

PDF

36.9 KB Created: 2020-10-26 14:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4323013dc5aac5b95d968e21d6d4750c SHA-1: 136bb667ebacb790cd06ddddf47b6aba72fea86c SHA-256: eee5b8d841e39358cf293aed217d6c40c5b6187da0243322d5fc1f2623fe7cbc
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to external resources, many of which are hosted on disposable domains and redirect to known malicious infrastructure. The ML classifier strongly indicates malicious intent, and the heuristics confirm the presence of a link farm designed to direct users to potentially harmful sites. No scripts were extracted, but the primary attack vector appears to be the manipulation of link targets.

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://gettraff.ru/aws?keyword=power+system+engineering+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f8af5aa8d1f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f939e47b87af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402486/normal_5f9288072b57c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f8d62a13cdbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f8f95cb36b9f.pdfIn PDF document text
    • https://sesorefamasupuv.weebly.com/uploads/1/3/1/0/131071262/3750174.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/rabaro.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/ac86b2b.pdfIn PDF document text
    • https://meporolokiso.weebly.com/uploads/1/3/2/6/132681401/b9f36c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379045/normal_5f8bb83e46703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5f93bf8058104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f8eef92614ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_5f87f8ca76c17.pdfIn PDF document text
    • https://guxeximufi.weebly.com/uploads/1/3/4/2/134235584/5147703.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/litisasevim.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/vavabi/51260347525.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/99354408680.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/81255864735.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/gatolikupur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8196dbd-5b9b-4c28-9f4f-d716482c0f2b/casas_en_venta_barrio_ortiz_toa_alta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25a26fb1-7a84-4520-b157-9861e92b1e01/46170650025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58139664-9ee0-48d0-a471-0c9622e29c1a/star_fox_rom_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51df82e2-c6c1-4f1a-9e0f-d68b66b7cc76/dusefut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdbf27b0-d9db-40b9-9066-f55e8e48e726/deguwotazawokedutujik.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_off00005090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5090 5516 bytes
SHA-256: 22a680151a3769d9980f16e015c6277cf1d9febe86e68a4ee5a878b170e44866
font_01_sfnt_off0000634a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634A 10184 bytes
SHA-256: 604b94202298feb50c0f3459df96a2ff995b05caef53f7da163eb29755d1c380