Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb726a53f8dac62…

MALICIOUS

PDF

40.8 KB Created: 2020-10-31 23:03:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 84a0ad3ef6f59608acad3b72f5fe221b SHA-1: 18a4435c03542b163c7199583e129a42f957017b SHA-256: afb726a53f8dac621fa7179da86c7e18dfd5e746153a1261c5eccdc8de31f092
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a known malicious URL, ggtraff.ru, disguised as an article for a school magazine. The ML classifier strongly indicated maliciousness, and the document's structure suggests it's part of a link farm designed to distribute malware or phish users. No scripts were extracted, but the presence of malicious redirector links is a high-confidence indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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=article+for+school+magazine In PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/kegusadatewunar_banifiwi_dovisupibezi_jegurip.pdfIn PDF document text
    • https://duxuborokepab.weebly.com/uploads/1/3/4/4/134449965/6173330.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/038885c85ecf8f0.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/bizovisizefowe-firuxid-wokudalonomum.pdfIn PDF document text
    • https://pekedilude.weebly.com/uploads/1/3/4/3/134324883/89a0297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388280/normal_5f98b00518d76.pdfIn PDF document text
    • https://fisizupesaxog.weebly.com/uploads/1/3/1/6/131636899/futevifulukipuva.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/fdfb6804-06b8-4902-af00-09091e95c1c0/34756609944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/644b1d14-49bd-4ab4-8a30-a2023795fb0e/design_for_the_real_world.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458fd6f1-fa23-43a8-97b1-6c5ee7a045d7/persona_3_portable_priestess.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1dba66-4ea7-40e5-99ca-4a8b3517fcb5/7309195973.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/mathematics_formula_class_10_in_bengali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632d6e24-91f7-4c0e-8a7b-d3b1867ebbbb/lonukipozodusile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb60675-4b3b-425a-b9b6-0ecde0c5d6f2/vw_polo_owners_manual_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/sanipos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/927e6e55-2415-4746-82ee-c2bcb443c182/xafobuvusegud.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_off00005ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED7 5336 bytes
SHA-256: b1e74a16cd0b41a749d056833868f22f07d48006d7a6acd4e2dba96a2bed3833
font_01_sfnt_off000070da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 11320 bytes
SHA-256: f649ec640b13303b5f852353ff46040e0e0eff9c363a706d541599c0deb93707

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