Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc40ddf9f4d0f0c5…

MALICIOUS

PDF

38.5 KB Created: 2020-11-01 10:53:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 332998d1632226f587f26eb821daf97a SHA-1: dac025c044844628c32fd3a9b55e49bb1f81a2d1 SHA-256: fc40ddf9f4d0f0c51f8ba37e37d31a7bb558c03311e710ef7ef465e9cfa76fbd
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=pure+icon+pack+apk+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_5f97490ecf180.pdfIn PDF document text
    • https://lavaseke.weebly.com/uploads/1/3/4/3/134383013/00612bfed4.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/075d3a8173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_5f9aaa1db6436.pdfIn PDF document text
    • https://biwazasidatuf.weebly.com/uploads/1/3/4/3/134373857/294d0d764.pdfIn PDF document text
    • https://jajedasas.weebly.com/uploads/1/3/4/2/134234666/2308556.pdfIn PDF document text
    • https://fimozafovobas.weebly.com/uploads/1/3/2/7/132741130/bipululomof.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/3393008.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/1/0268/8178/6032/files/autobiography_about_myself.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6914/3708/files/54861613043.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4242/5000/files/50753333436.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4565 5388 bytes
SHA-256: 12d8a169e17bb229552f697211254d5417d829df0d3c6d2cdd1d41dc87968bce
font_01_sfnt_off0000583d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x583D 5048 bytes
SHA-256: 3a814765d4fa73f1941e7827b9b437c039108b60d5c4f75bbd58980d5ef4515b
font_02_sfnt_off0000698c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x698C 10408 bytes
SHA-256: 4698e9f67e01ccba7af184d2be8234b8ed7f3af194bd71d2c493fe292e0b73b6

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