Malicious PDF — malware analysis report

Static analysis result for SHA-256 34534b4e8e5c71a4…

MALICIOUS

PDF

44.6 KB Created: 2020-10-26 18:30:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2f6a9215f8494293f61f41294cae2ed6 SHA-1: 14a91526edf5b0260a83ee5995db73ee3e2443b0 SHA-256: 34534b4e8e5c71a4eff3facbfa2160ec5b39e807b5edab6ee18e03785b5c2091
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://gettraff.ru/aws?keyword=performance+appraisal+process+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f872ea0c3a95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407299/normal_5f93b70c856f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366031/normal_5f8715547da07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5f9517af77a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5f8cfdde0ad90.pdfIn PDF document text
    • https://pesajupamobe.weebly.com/uploads/1/3/1/6/131607203/1ce0597.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/10221.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bamudepekepa_setumazowido.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/4d2f17ad71fb9.pdfIn PDF document text
    • https://nogafuku.weebly.com/uploads/1/3/2/8/132815296/luvavedefafa.pdfIn PDF document text
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/tofowudifagig.pdfIn PDF document text
    • https://gexumuvebevo.weebly.com/uploads/1/3/4/3/134312536/5250727.pdfIn PDF document text
    • https://gagumosesixibo.weebly.com/uploads/1/3/4/0/134018544/7807418.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/1867598.pdfIn PDF document text
    • https://jirixakevafu.weebly.com/uploads/1/3/4/4/134404576/79788.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/1/0484/2969/5134/files/62976892988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1185/0407/files/best_android_app_software_for_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1859/8558/files/molecules_and_compounds_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/fepigalonadima.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/sugeru.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/nattakurinji_varnam.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/isometric_and_oblique_projection.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_off0000718a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x718A 5300 bytes
SHA-256: 13c397b2c39f3c946c37dcaf63ee15982f71e9b26a277468854a4ce0dc6e658a
font_01_sfnt_off0000836d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x836D 9740 bytes
SHA-256: 63c36fd3ff4d485b3027f389a380aaf07019a2083c075ef6e87e566adb4898c8

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