Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d89f6a1147a32eb…

MALICIOUS

PDF

43.0 KB Created: 2020-10-14 22:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 82954d3abd11a0e326187c7bd7e69f7e SHA-1: da0b7bbe505e7c0401b0bb1d1bcba64e37993a6e SHA-256: 0d89f6a1147a32eb958d89e7d236c7b109829dd3d9bc40e2156158440c030ad1
192 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, suggesting a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?keyword=macmillan+english+grade+4+pdf In PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/fuziwakirub.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/vaxujow_gebonem.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/vigirupiruwovilav.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/0e81a5aa.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f8730d6ea58f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f871f1649e6b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3884/6371/files/wukujokugig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3629/0467/files/4147676100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/eastern_catholic_churches_usa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5970/7037/files/18356245178.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9020/6101/files/black_and_white_crunch_bar_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd917f50-4892-4df7-807c-7e66e854da13/pewufezaxumapalameregebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c155f69-939a-4430-9a70-091d1d25b485/93662656933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a949e0-bd38-4642-926c-2da06cafcee4/wegafapegumufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f301b4-49f4-47f6-8afa-b42b938831fc/nepodene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/0903/9272/files/lowivepedek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5920/3234/files/9788841327.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3178/8182/files/the_willows_algernon_blackwood_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e0b34b7-b79c-45a2-a03f-897307ed177c/38445926771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358bd9e9-78d1-46be-9863-96b72079034e/mapafufubapifotitokur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e0d7b3-b13d-4389-8601-c4b004a20834/30238025144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d34489-d5c2-49c9-bf98-bd4910b05f8f/zegigadanodavuzogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785c3720-b800-4131-a746-c09e9079520e/47619373672.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_off00006904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6904 5664 bytes
SHA-256: 03ddd3101a1c68aebba0602b0b776f7ad039bf867019f46a4de9458f0e8b5add
font_01_sfnt_off00007c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C19 10044 bytes
SHA-256: 27d18a41c7f4193e3b387c017502120eb37fdd815417c357a7f39aede4900cea

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