Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f162d025ee138d…

MALICIOUS

PDF

39.5 KB Created: 2020-11-03 10:42:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 36220215608e0d75bd3103f813c02bbd SHA-1: 31ceca1659399b18398fb8d1c14091bfc9792e97 SHA-256: 79f162d025ee138da0a57d5291f0fe7be7ebe670a965dd1a055052985b0b4180
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though corrupted, contains text related to a school calendar and a URL that is also present in the heuristics and IOCs. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a SEO poisoning or link farm tactic.

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/123?keyword=washington+county+school+calendar+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f889326c88ac.pdfIn PDF document text
    • https://vumuzuvi.weebly.com/uploads/1/3/4/5/134506571/burujakile_geronoforedavuw_dobarov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5f90485186aff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/96860180304.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/maliwoj.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/36852639810.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/calculus_3_jkuat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2743ffd1-a278-410f-a7bd-9c1d37454e50/34994179318.pdfIn PDF document text
    • https://s3.amazonaws.com/gebaxovudofe/igaging_absolute_dro_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/52533074142.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/botany_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/elementary_algebra_worksheets_with_answers.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_off00005bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD8 5588 bytes
SHA-256: b16c1295584ca02c1f8b6b82e830655216d205be2bd19a025c156e277633ad83
font_01_sfnt_off00006ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE5 10032 bytes
SHA-256: 99dc5dd1da17ce2d4bedfd3ce050295783bee04d0407f41ef7832019cfc2845e

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