Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e9099d91b6d6ed…

MALICIOUS

PDF

49.5 KB Created: 2020-10-31 20:11:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a051cce436ea7936672dfea0d8dc11bd SHA-1: 9d50185d8003021e809918567593ad4d6cf44293 SHA-256: f6e9099d91b6d6edb59af7ddce1619b11aa1850f7c8c5690d23eecb9d7f1d85a
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://ttraff.club/123?keyword=network+cross+cable In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f8e1bd6a34db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f872fad4443e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f9cccf016214.pdfIn PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/2334273.pdfIn PDF document text
    • https://zafojepomekosax.weebly.com/uploads/1/3/4/3/134352399/8048307.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/fd1b55a95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f91b8913292e.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/xomorole.pdfIn PDF document text
    • https://xebivonejawaf.weebly.com/uploads/1/3/4/0/134096192/vogogesidijetub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8571e2-348d-4713-a750-286e09c4c59c/vosejaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74bb9a7f-4ef0-4325-aa86-40e5595f26b1/fivupidenijedagowujinefas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b91ba46-0b13-4f80-a5b9-82db37b65f52/42152477382.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6240f6e9-fda9-457e-a538-5f814b52c255/93316421489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc1e06d-2661-4db3-8a08-f86f64423464/96945988815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a349ef69-ea19-44ae-a23d-ad228dc8c660/gitixaroborukagoxamena.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000668a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668A 5060 bytes
SHA-256: bfa2d3bcdb391ad17216fab49b8798d79f9fb88f40e6783598564b752147563e
font_01_sfnt_off000077ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77EC 11568 bytes
SHA-256: 2255385a519acf76f33e86a2fa7ae6c3badb9e938926c4e97fb39a9cde7a4062
font_02_sfnt_off00009f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0A 17600 bytes
SHA-256: d45a7b4577ed8a5ed13469750217e816e0c1994b9b322107cfc1dce496095331

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