Malicious PDF — malware analysis report

Static analysis result for SHA-256 a829ad4f1ac0fd67…

MALICIOUS

PDF

36.7 KB Created: 2020-10-28 23:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d2d39f00b5c1307a5090f9b5b148a4cb SHA-1: 10e35750aae4084e39dd9b5a0d35bb9960e440c7 SHA-256: a829ad4f1ac0fd6717fcc083bcebd529ca0615ffa629f1eb7eee83bc9f2fd679
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://gettraff.ru/aws?keyword=space+jam+streaming+123 In PDF document text
    • https://jirukikemika.weebly.com/uploads/1/3/4/3/134310088/7018479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_5f98083f68c9a.pdfIn PDF document text
    • https://penepanixefi.weebly.com/uploads/1/3/4/3/134354239/7121114.pdfIn PDF document text
    • https://julapaxukej.weebly.com/uploads/1/3/4/4/134492969/lopin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382617/normal_5f8d8555d2302.pdfIn PDF document text
    • https://vodoxakitukep.weebly.com/uploads/1/3/4/3/134335140/sujojaredudale.pdfIn PDF document text
    • https://patelevenimo.weebly.com/uploads/1/3/1/4/131437444/rexogosuwubegifub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f98e7f03583b.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/f57f7575-2412-4d6a-a066-bb5293abcdd1/sisuvudebitowomigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8427/6415/files/4327539333.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8292/2181/files/soundasleep_dream_series_air_mattress_warranty.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/83643294995.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/steuererklrung_anlage_av_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/urdu_alphabet_writing_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/18498276469.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1645/2799/files/bubaxupitamazafavigab.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/wing_chun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75355c0-b615-4a43-81b7-5a4f2ccc0b3d/gimibijasifazu.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_off00004efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EFC 5748 bytes
SHA-256: ce7add7ff00932044bcee4d84499c96df32652c73e3e1caa7b227c7ece2c11ce
font_01_sfnt_off00006286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6286 10364 bytes
SHA-256: 127e782f7cb4038fbab85eb95a5adf96f1e619aeab3a5e3e8c775b3ed0f3bd25

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