Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc0775fb6dbcf5f…

MALICIOUS

PDF

34.4 KB Created: 2020-11-07 18:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5a54b8d8419b16058e0ace03b51fe255 SHA-1: bb6b9683373f4a3815f9ea2864b755acbc317063 SHA-256: cdc0775fb6dbcf5f5b0ecc7060c3a029c465ba7b66b1c1f1bb20fce8e37855a5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable domains and WordPress sites, indicating a link farm for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/123?keyword=7+life+processes+worksheet. 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/123?keyword=7+life+processes+worksheet In PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/fuxurepuneso_degufub_gerakujuvox.pdfIn PDF document text
    • https://bibeluwevolaru.weebly.com/uploads/1/3/4/4/134497964/4932754.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/3714528.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/676684.pdfIn PDF document text
    • https://kudumegowejo.weebly.com/uploads/1/3/4/2/134266354/9032493.pdfIn PDF document text
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/buxumon_fazit_butifumaju_gipirulidafefe.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/6497588.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://kefidunofu.files.wordpress.com/2020/11/fomemoda.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/download_real_gmod_apk.pdfIn PDF document text
    • https://pazujuruki.files.wordpress.com/2020/11/19760618442.pdfIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdfIn PDF document text
    • https://memitapi.files.wordpress.com/2020/11/46047411952.pdfIn PDF document text
    • https://futizotijipi.files.wordpress.com/2020/11/14248446743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a48867-c0aa-4408-8680-8408e34d3c41/jofidekorotatabukobef.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_off000049a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49A6 5032 bytes
SHA-256: e20af9472fa3cbd704443d0d1ec2d1e4b11ff37c4b0de4b37c23c9015a96f4f1
font_01_sfnt_off00005adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADF 9720 bytes
SHA-256: e2bd1a53e0ccab66c7d096c1755b3b6b85683ecab5dda1e18cb5c0ccb698c2fe

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