Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55d71e9d739f8ff…

MALICIOUS

PDF

85.4 KB Created: 2020-12-22 20:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fa430ba6dab17df065a7a7afd745d0ab SHA-1: 9a7b2cc5e2c87974f59bcc312a0c2c74c10745cc SHA-256: c55d71e9d739f8ff24b015366ebe7764deacb6c6888475de150a077abee205bd
162 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 URLs, forming a link farm and pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a redirector suggests an attempt to funnel users to potentially harmful content or phishing sites. No scripts were extracted, but the structure and URL findings are highly indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/aws?utm_term=solucion+hipertonica+al+3+preparacion+pdf In PDF document text
    • https://bosijoputa.weebly.com/uploads/1/3/4/3/134317673/8673b3f4d.pdfIn PDF document text
    • https://pudufanosi.weebly.com/uploads/1/3/4/3/134324904/witawirafoz_pobitupuvosu_divarilami_vokepepamel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_5faa0a2b67286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f8a475194684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389823/normal_5fc72a1445ac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_5fa71b15dcbac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471690/normal_5faa2b70e65ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_5f87d9dcb3f46.pdfIn PDF document text
    • https://fajasorefasox.weebly.com/uploads/1/3/4/3/134348900/bilinij.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/bd9538ec-6bc0-48c9-be2a-7d650f19acf1/pathfinder_2e_bestiary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9370c5-8da8-4ff1-8e9e-421920ea3d80/gunikakagirotanirodov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7177fa1d-5f29-4c99-aea8-fa2639490d04/jejezokukug.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_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 5332 bytes
SHA-256: ea2304cfbab1c2bdd35d9579179d1d74c434772d0aa67b9534afbb4c85e41493
font_01_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 11892 bytes
SHA-256: fdb3c8d5d7872974460972583cfc1233babc8f17b79c5997ed15d1ede64d5bca
font_02_sfnt_off0001339c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339C 16084 bytes
SHA-256: e610f5c0128a54b8b5947c8e53bf326ae4dd59110ea045fa5dafef63e908fa85

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