Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ef7bd399c5fabb…

MALICIOUS

PDF

36.6 KB Created: 2020-11-02 02:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8822ce8722ed19ffba8536ee75525b1e SHA-1: e33368d2408724d29239a8fe6d8c483faaeba50b SHA-256: 32ef7bd399c5fabbae502b4a41e7204bc4048749100ee2585b0f5151751c9459
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable hosting and likely part of an SEO link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://cctraff.ru/strik?keyword=sonic+sprite+fan+character+maker+game'. The ML classifier also strongly indicated maliciousness.

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.
  • 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://cctraff.ru/strik?keyword=sonic+sprite+fan+character+maker+game In PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/jagufarepa.pdfIn PDF document text
    • https://tuvozejuwubox.weebly.com/uploads/1/3/4/3/134323710/8498232.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/luwukigidijuw.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/webojaw_puberore_navowupopikofo.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/jedaxipatab.pdfIn PDF document text
    • https://gudojovevisepu.weebly.com/uploads/1/3/4/3/134314990/mesadewirupovox-revijudonuza.pdfIn PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/sibaw-deledosoziza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5f94d4a3a063c.pdfIn PDF document text
    • https://kisogegexene.weebly.com/uploads/1/3/4/3/134374262/diwopotasaso.pdfIn PDF document text
    • https://gulobabamufo.weebly.com/uploads/1/3/4/5/134514795/3a6f9c0022ee.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/1/0438/1717/3152/files/66314251335.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/15328649823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8808/8728/files/11907521165.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_off00004c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C97 5564 bytes
SHA-256: c80bec0842eb049b95b68831e7192147acf7dceb13bbe55010ebe3bb49e033c5
font_01_sfnt_off00005f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5E 11248 bytes
SHA-256: 902c22d48fc3cdf448d2e52564caaea4bb720586db2e80107e9ac90f93e8a4a4

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