Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f83a0dc150ef5bf…

MALICIOUS

PDF

56.0 KB Created: 2020-11-03 00:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8de514b74f4aca0e1aa47efcc9ae9fb6 SHA-1: d1e053609f01ec49d3baece8176f3128290449e6 SHA-256: 1f83a0dc150ef5bf1249401b64f056eaf4fff989ad6f4c370ceb6f90e7d79957
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://ggtraff.ru/strik?keyword=snapchat+apk+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377674/normal_5f8dc43b24e86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5f9356fa61403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_5f9c5177217c6.pdfIn PDF document text
    • https://raxiruzaxulam.weebly.com/uploads/1/3/0/7/130738564/5631203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f8b901138eb2.pdfIn PDF document text
    • https://kifenefaru.weebly.com/uploads/1/3/4/3/134327755/1836977.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/retisovojor/conditions_for_american_soldiers_in_vietnam_war.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/zamudumubiritijudobun.pdfIn PDF document text
    • https://s3.amazonaws.com/taruzudov/presence_amy_cuddy.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/josunu.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00007bda.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7BDA 12764 bytes
SHA-256: 37c4d77b223fb184a43c396da090d271af2c5a368e61d4bef08645477767cc2e
font_00_sfnt_off00006bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC3 4788 bytes
SHA-256: 80c45b69c083823a7c7a4e3b68c463afb65dfc5769702147c55b0d406a89e810
font_02_sfnt_off0000a036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA036 10768 bytes
SHA-256: e4cf1d5da8065f1ba64a6359598e9257c793b28d1864961806c2d322c12e98bb
font_03_sfnt_off0000c521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC521 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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