Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8c6562d411e967…

MALICIOUS

PDF

143.0 KB Created: 2020-10-31 00:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 8f5049a8e0fedc6aae7ca2b98ed95fab SHA-1: 1f5979c6abdd6af12edb7833125747bf96830c1c SHA-256: 6a8c6562d411e967f5588c7c04c692175e08a43d3693504ec98fcb30e08c86d9
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 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://ttraff.ru/123?keyword=natural+selection+m%2526m+lab+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382627/normal_5f9aa09b5aa10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5f8b61b59af7d.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/fafefasewejive.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/1/0499/2791/3640/files/diccionario_etimolgico.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/gudiresipe.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/natib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0116/6000/files/how_did_islam_spread_so_fast.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2207/1983/files/sheepshead_bay_theater_frozen_2.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/76614841474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1150/8904/files/ecto_tokens_guide_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/zutejeveganimebu.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/kimenimenegulupavufur.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/12_inch_table_saw_home_depot.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001f477.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F477 32896 bytes
SHA-256: ab69b43c90addfc7c818140421d4536f9990747260ce56d8a7510294910f5e00
font_00_sfnt_off0001b935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B935 4916 bytes
SHA-256: b5581ccd58ccbf4f0efd6a0885b9aec614ba85ad2b4fd7f0d61d59c87d43f4e9
font_01_sfnt_off0001c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9D7 13212 bytes
SHA-256: df179467d219ce23125d9aaafa6972e505e8d13170259a45827590587f5c64c2

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