Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73d5ca4337c9571…

MALICIOUS

PDF

37.1 KB Created: 2020-11-05 05:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9f3864f5503e5c87c032667bdb89b164 SHA-1: 980229b1e5a3352f32735b5c4d5629c847785ee6 SHA-256: d73d5ca4337c95715f105bd44a887a83eeecc0ea9356d516fe6bd45c9bc5f392
154 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 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.
  • 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/strik?keyword=the+great+gatsby+study+guide+answer+key In PDF document text
    • https://sivagodumojuji.weebly.com/uploads/1/3/4/2/134235915/zekika-bakugal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_5f9db9238ff54.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/xupurukomakufogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f87761bc535f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_5f94d4ad5fcd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5fa192f202ab2.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/lipixalog_romaxodewuj_lurajuwosoruvof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5f8d70cc7d429.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/1/0434/5587/3190/files/concrete_railway_sleepers.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/34088605764.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/8365498838.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/pugevivegirirewuwukib.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_off0000535a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x535A 5404 bytes
SHA-256: d96e951e8ba825d52dcd396f956f7d6fad8cb338dda42538696ad8af0fcc649b
font_01_sfnt_off000065c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C9 9984 bytes
SHA-256: 6a5a0661eed1be12a4d5a67f7d8cdf9db4053f9ac0450cc3651d7fef41b1a447

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