Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d529ee21a345b2…

MALICIOUS

PDF

56.2 KB Created: 2020-10-10 14:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fa2c8c58da7703f43ddc8a10e052b65e SHA-1: d2ffd0070938891aa7090d13a30142ff6cdf750b SHA-256: 77d529ee21a345b2876ebe22ef4d97c04a0833baf2a9ef96cb660b463d0ddccc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious due to its function as a link farm, containing numerous URLs pointing to potentially harmful content. The presence of a redirector link to 'ggtraff.ru' and a large number of links hosted on disposable domains strongly suggests an attempt to lure users to malicious infrastructure. The ML classifier also flagged this sample with high confidence.

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/strik?keyword=relleno+sanitario+ventajas+y+desvent In PDF document text
    • http://jubaxalo.goldemansgreenhouse.com/uploads/1/3/1/6/131606349/jagufos.pdfIn PDF document text
    • http://files.nowspajuneau.com/uploads/1/3/0/8/130874350/giboxogaxez.pdfIn PDF document text
    • http://jeban.somersworthmusicboosters.com/uploads/1/3/1/4/131407014/fejosajuninube.pdfIn PDF document text
    • https://site-1045398.mozfiles.com/files/1045398/88335724350.pdfIn PDF document text
    • https://site-1038675.mozfiles.com/files/1038675/7140724510.pdfIn PDF document text
    • https://site-1038508.mozfiles.com/files/1038508/60715333059.pdfIn PDF document text
    • https://site-1036818.mozfiles.com/files/1036818/monadudadi.pdfIn PDF document text
    • http://files.thebackyardsalad.com/uploads/1/3/1/4/131437889/wuwurabunuwomu-lisubu-tumuwod-lifobo.pdfIn PDF document text
    • http://files.myequinesolutions.com/uploads/1/3/1/6/131606261/8298384.pdfIn PDF document text
    • http://files.cronistaviajera.com/uploads/1/3/0/8/130874437/jogemenagode_banoguwuteri_dubegutonapif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6921f37a-c18e-4143-b6f2-40582f7ef04e/19531801437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2acbc239-293a-4203-88a8-bd6d174adae4/76666909439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eade2c1-7b5a-4571-8ada-6174dc5c539b/bebawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87bceec-7132-450e-be9b-8868b2fd1d4b/94555535963.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_off00009c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C26 5064 bytes
SHA-256: 321c59c3085cbcafa70c180894e7a561cafe40dd468b58322aa8ba1e9be8d402
font_01_sfnt_off0000ad80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD80 11236 bytes
SHA-256: bffb780db7d2f31ab5ecc9d51901d011d47ea8eff075c7a1291dce5f95cbfb5e

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