Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27f7cda9ca42288…

MALICIOUS

PDF

101.4 KB Created: 2020-10-29 12:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 08aad74c79298b3e7ecb2a5e40624633 SHA-1: 3746e548686467da48fea5f5cf47cbf24307af3d SHA-256: d27f7cda9ca4228802e41fa8498e90685e09e06a3793415a1d67b4cb51f12e0d
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, with at least one identified as a malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to external, potentially harmful, resources.

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.com/123?keyword=exit+4+nj+turnpike In PDF document text
    • https://jidugurulepapol.weebly.com/uploads/1/3/4/3/134310086/23f7cc94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5f906d5c56414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_5f918be727151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_5f8d76a34c9f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_5f987a5fb7499.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/1285448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_5f9443afe549f.pdfIn PDF document text
    • https://kijudizi.weebly.com/uploads/1/3/4/3/134321523/jaxedel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_5f9240ac0eca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392652/normal_5f9694bbc5b2e.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/pazifetanegapu/refukemitaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c99ce3d2-ea0f-4188-b942-2232ea6ec03f/63711877209.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/72970036990.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/vipazijaxogexoki.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/advanced_tung_style_acupuncture_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c07bcd3-57b0-4f18-8aef-b45832fb6966/38075823873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad19d2df-da31-4f90-aa1f-1c1195d032fa/9190342300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74dd935-5b11-499f-85a7-16d243cb015e/18241185085.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/finite_abelian_group.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/28283717523.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/91066085917.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/nh3__hcl_nh4cl.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_off00014215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14215 4648 bytes
SHA-256: 704ca6b9602173fb8f5f4247b30bd862edb4e5b44871ccfaebdaf19512b4447c
font_01_sfnt_off00015207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15207 17440 bytes
SHA-256: 58c2d97460acd03465e6e55d20312864769dd74f334c5a8bd86f81fdf29b8ca8

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