Malicious PDF — malware analysis report

Static analysis result for SHA-256 856385c2ef242204…

MALICIOUS

PDF

80.1 KB Created: 2020-11-18 21:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c620bedfae5ab5ce8e01ff89e963e449 SHA-1: 17743f5a4db3782c8f8e5f3458b45b7cbda441e3 SHA-256: 856385c2ef24220433dee0f78984606dcadfa2845a67f59fee781b3eacb48ac6
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, including a critical redirector link to 'cctraff.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting the malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/strik?utm_term=boboiboy+the+movie+2016+free+watch+online In PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/bcb60.pdfIn PDF document text
    • https://gatofofuxiwiv.weebly.com/uploads/1/3/4/2/134265530/8660584.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/zabodo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_5f9cce8b6b44f.pdfIn PDF document text
    • https://zafitageleg.weebly.com/uploads/1/3/4/4/134489703/3579868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f9af5b34059c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_5fad62c47011f.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/c993006a-a463-490f-8b5c-6ba3eada87ae/baixar_pro_tools_9_crackeado_para_wi.pdfIn PDF document text
    • https://s3.amazonaws.com/remoxi/youtube_google_apps_referral_program.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/12666145592.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/ultimate_tennis_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/boost_c_application_development_cookbook_2nd_edition.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_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 5864 bytes
SHA-256: e4b92b5a09cbbf61d115ee77ef4050ce234248b8f287a1f13ae5856876ff0f83
font_01_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 10552 bytes
SHA-256: 88c96cb9d6cac67122ac5e1238844a483bf1923292c5847707b9bf1d2b4a3f54

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