Malicious PDF — malware analysis report

Static analysis result for SHA-256 1218ca765d86d01b…

MALICIOUS

PDF

42.0 KB Created: 2020-07-09 06:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: a2ba07ca642d8beb61aa1dabe259d755 SHA-1: d5a9969ea829643255f18ca49d58375cda4fef2b SHA-256: 1218ca765d86d01b1c9e85af99a71688166c1a786382b43ad12484e75a7e79a8
184 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDFs hosted on disposable domains, indicating a link farm for SEO manipulation or malware distribution. One of the embedded links, 'https://ttraff.ru/wb?keyword=quimioterapia%20de%20las%20enfermedades%20microbianas%20pdf', is flagged as a malicious redirector. 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://ttraff.ru/wb?keyword=quimioterapia%20de%20las%20enfermedades%20microbianas%20pdf In PDF document text
    • http://files.buffalotimberbay.org/uploads/1/3/0/7/130739343/vujewerowegukaf-tetevimitaxu-zigutu-nukena.pdfIn PDF document text
    • http://files.whatkriscooks.com/uploads/1/3/1/4/131437832/nubekujom.pdfIn PDF document text
    • http://files.marvinjwolf.com/uploads/1/3/1/6/131607023/6f564be9.pdfIn PDF document text
    • http://files.alphadesign.studio/uploads/1/3/0/8/130874123/05df5.pdfIn PDF document text
    • http://files.oursaviourchurch.org/uploads/1/3/1/4/131454549/kobufijolimet-gejesalunekovu-vosolimufuju.pdfIn PDF document text
    • http://files.chenweimeng.com/uploads/1/3/1/1/131163920/841558.pdfIn PDF document text
    • http://files.dutchessalanon.org/uploads/1/3/1/1/131164418/4827076.pdfIn PDF document text
    • http://files.minutiamuse.com/uploads/1/3/2/6/132682819/womomatufotob_pomas_vanog_zemokima.pdfIn PDF document text
    • http://files.mainstreetoptometric.com/uploads/1/3/2/7/132740482/3722786.pdfIn PDF document text
    • http://files.murphymedicalwriting.com/uploads/1/3/0/8/130873838/fevewili-rumujez-batex.pdfIn PDF document text
    • http://files.roundbay.com/uploads/1/3/1/6/131607269/b855589b345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jidolapuli.files.wordpress.com/2020/06/2917520345.pdfIn PDF document text
    • https://kalovajonal.files.wordpress.com/2020/07/13037966570.pdfIn PDF document text
    • https://sepuliw.files.wordpress.com/2020/07/83111392858.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F0 5384 bytes
SHA-256: f01fea4066db6dd8b164529c5c89b06839539b9532b60c0a54e333a01af0d13c
font_01_sfnt_off00007816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7816 10160 bytes
SHA-256: 35d01aafca27ab6025195f33fe4ba430c68d01b85a262c02dfc92dee4c0d0a9b

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