Malicious PDF — malware analysis report

Static analysis result for SHA-256 0831e5d21e57ef1f…

MALICIOUS

PDF

46.9 KB Created: 2020-10-30 17:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ed5659e969463cbb33f471a71a392f7c SHA-1: dc1abb9e5617660e6cebb638e07d2801904ac3f0 SHA-256: 0831e5d21e57ef1f20978397fa919b0e2238e64c9f974e7e3422e7220022571a
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=papa+hot+doggeria In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5f9be8dba8d59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f882f2cbba16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383567/normal_5f9a449f72d1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_5f96cfe8cd831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f8d336a9051a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_5f91d78e51dc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9235/2932/files/wuzukorim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6b6afb3-ee8a-4f18-9cdb-816fccaa269b/qu_msculo_est_utilizado_para_intr.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/50072093090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9dc925-4467-4536-8fcc-162930a01e01/sibaxegomevilaf.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/sabebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0558/2244/files/xavijafevol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7754/3107/files/whats_igh_mean_in_text.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5882/6909/files/70725295207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2efae634-88f0-4231-8f4b-a4a24cf26d47/1413840270.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68B4 4692 bytes
SHA-256: 2ded2b5c635d12411d49c2f60c812f3d1e9f620d96d43b52cfe5353b9104e672
font_01_sfnt_off000078bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78BC 12404 bytes
SHA-256: 08b733d3527651e2c36db6bf1e789ea958926af3d0f6c4b8e96efe430829d701
font_02_sfnt_off0000a08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA08C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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