Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cc858a44f7a0bc…

MALICIOUS

PDF

47.5 KB Created: 2020-10-31 22:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 658310b759b55fba2cd831ac4620bf51 SHA-1: 8faa1cdef72f339dd680945acd4aa221289d5b0b SHA-256: 91cc858a44f7a0bc01c2219e7912e34a1818b8294d2eeca61daa03673105d375
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://gettraff.ru/aws?keyword=deadly+little+secret+pdf'. Additionally, it exhibits characteristics of a PDF link farm, containing numerous external PDF links. The presence of a 'download button' lure further supports the malicious intent. While no scripts were directly extracted, the PDF structure itself facilitates the redirection, likely to a second-stage payload or phishing page.

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.
  • 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://gettraff.ru/aws?keyword=deadly+little+secret+pdf In PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/2a5ad8bcb27f8a7.pdfIn PDF document text
    • https://gimelukisisira.weebly.com/uploads/1/3/4/0/134040832/gajiwuguwerilewoxab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f8ebb5f76c60.pdfIn PDF document text
    • https://zenovoruzunej.weebly.com/uploads/1/3/4/3/134339910/xifepagejobetuxovori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/60604337600.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8763/2286/files/xasawivutetalixidutejilo.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/defipoleduzuxatuxavizopo.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/57918354896.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/force_mass_and_acceleration_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/abdominal_trauma_journal.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/peavey_cs_800_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/engineering_mechanics_centroid_and_moment_of_inertia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5959/1321/files/pobukiwugisonamirakiwov.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_off00007a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A04 5248 bytes
SHA-256: ea111312237a083bb6f7a580208cd8d74048daedca1f9c2bd1d1b78a7c54527c
font_01_sfnt_off00008c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C01 11080 bytes
SHA-256: e6588b01f68f0796a6ca90d969dee221006ac01c81f8fee25ca0746309a69c18

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