Malicious PDF — malware analysis report

Static analysis result for SHA-256 e22957d4cfed4edc…

MALICIOUS

PDF

46.1 KB Created: 2020-10-15 13:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fddf9fc87467f46f2f5eb54c19a58ac3 SHA-1: 146c3100cb6e919728b781b384bcc4286b0982f2 SHA-256: e22957d4cfed4edc0bfd4a81c4d9cd1b11e55b1acff777fc7af3f8805ac32b2e
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 PDF files hosted on disposable domains, suggesting a link farm or SEO spam campaign. One of the embedded URLs, 'https://gettraff.ru/pify?keyword=download+pdf+gratis+para+android', is identified as a malicious redirector, likely leading users to malicious content or further phishing attempts. The document body, though heavily obfuscated, contains similar URLs, reinforcing the malicious intent.

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/pify?keyword=download+pdf+gratis+para+android In PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/7386287.pdfIn PDF document text
    • https://femevidawivuk.weebly.com/uploads/1/3/1/0/131071063/sibidatiza.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8925184.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/59f83aff.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/7538137.pdfIn PDF document text
    • https://site-1039907.mozfiles.com/files/1039907/rewikila.pdfIn PDF document text
    • https://site-1036832.mozfiles.com/files/1036832/16455189983.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/xenemavurinap_jokepirewiteda_fijalezej_gemewije.pdfIn PDF document text
    • https://ruwopevod.weebly.com/uploads/1/3/1/3/131397973/porenakis.pdfIn PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/nuvotuzopib.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/bapujim.pdfIn PDF document text
    • https://site-1036858.mozfiles.com/files/1036858/71556549235.pdfIn PDF document text
    • https://site-1043332.mozfiles.com/files/1043332/50973597441.pdfIn PDF document text
    • https://site-1040104.mozfiles.com/files/1040104/37789803736.pdfIn PDF document text
    • https://site-1036883.mozfiles.com/files/1036883/bupim.pdfIn PDF document text
    • https://site-1037202.mozfiles.com/files/1037202/22716875551.pdfIn PDF document text
    • https://site-1039533.mozfiles.com/files/1039533/42904468833.pdfIn PDF document text
    • https://site-1039503.mozfiles.com/files/1039503/65390449169.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d9d252b2-85ee-4f48-b2ca-9719ce09fb5b/puzuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6302847-e62b-4486-8dd3-4074f6d60b60/41370610912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033d981b-2d5c-4511-a05b-19f47c869ec2/20293387330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7d6475-58d8-4466-810c-af0062185966/banejevexipejipixipixupi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000674e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x674E 4972 bytes
SHA-256: 86862b90fe9ece7ff4b79ab82315c8f39e6e373d2927b6e452af0c14b0fa3392
font_01_sfnt_off0000784b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x784B 11280 bytes
SHA-256: 45d8fdb567587dde7cc81d458fd7f9c417c9f7109f8ab03642b48fd82aad518e
font_02_sfnt_off00009c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C7E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378