Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6a1ac0e20e03b3…

MALICIOUS

PDF

58.4 KB Created: 2020-10-26 18:25:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7023870db6d1928e5e8abcaf2f032431 SHA-1: 260fc5a81c2f38603859b72cac432053d06717ab SHA-256: 5e6a1ac0e20e03b31c19d1947b8ba74097cfa2081e15da297e12379b94959623
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body and heuristics indicate a pattern of SEO poisoning, where links are disguised as academic samples to drive traffic to potentially malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/aws?keyword=ielts+writing+task+1+academic+samples+band+9+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393197/normal_5f90f128d5d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f93039dc4a39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f8e03aad73dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_5f91607ed4af9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f8824dc5e45c.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/kuwekewugi.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/jogowezokuvaxu.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7d3707d5d.pdfIn PDF document text
    • https://buxivadoga.weebly.com/uploads/1/3/0/7/130740323/c8c81.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/5278095.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/luropi/87091271428.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/carcassonne_river_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/chemistry_form_4_chapter_6_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/93896607745.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/wurapodiselowumirofavatep.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/multistage_amplifier_design.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/15960902919.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/pudena.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/corso_di_armonica_a_bocca.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/78392753243.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/bubble_sort_in_data_structure_with_example.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/72972070226.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/blackbird_tabs_guitar.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/7_chakras_in_human_body_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/neuralgia_del_trigemino_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/gto_thyristor.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_off0000a292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA292 5916 bytes
SHA-256: d55e6b7673d54a079d0a4da5d1548b613752a394a3e623ffd89f71de783e13ae
font_01_sfnt_off0000b6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AD 11108 bytes
SHA-256: 3ac877cedddbba75509c350712e54b3bdcfc2e387716b3c26fae2d1ae5f9f820

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