Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6aa14bd2410cae…

MALICIOUS

PDF

75.5 KB Created: 2021-01-12 00:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 26436eed7f28366e6145025927a297dd SHA-1: 5042f703deaa1acc33c0ebee20bd89aa829b4dcd SHA-256: 6a6aa14bd2410caeaa1b75880cfe4b7d07132fa5e27193f16d86d3a95f09ff66
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains multiple heuristics indicating malicious intent, including a critical finding for a link to known malicious redirector infrastructure and a high-confidence ML classification. The document's content and heuristics suggest it is designed as an MFA or one-time-code harvesting lure, aiming to steal user credentials or session tokens. The embedded URLs, such as 'https://ggtraff.ru/aws?utm_term=access+icloud+photos+on+android+device', are likely part of this phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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=access+icloud+photos+on+android+device In PDF document text
    • https://site-1195763.mozfiles.com/files/1195763/ritidideduzipidamobeten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5fd6a1d33543a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5fa3a3e137f16.pdfIn PDF document text
    • https://vowopazi.weebly.com/uploads/1/3/4/0/134096587/2341111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_5fb8b63d326df.pdfIn PDF document text
    • https://cdn.sqhk.co/nibedogoxov/dghg4jh/josilomotuzidesorufuxe.pdfIn PDF document text
    • https://site-1178101.mozfiles.com/files/1178101/92467442488.pdfIn PDF document text
    • https://cdn.sqhk.co/xonivozew/bgeUiiU/kemasepuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f99c1c41ac07.pdfIn PDF document text
    • https://cdn.sqhk.co/zubixola/hqeHhda/samsung_smart_tv_with_youtube_app.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/wikurixobelu/e_safety_poster_template.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/new_york_shark_game_unblocked.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_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 5208 bytes
SHA-256: c13dd28eb044a878c923defa6090dcb8d1654790cd352faf02acf20ce88b54f4
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 10392 bytes
SHA-256: 1e6181d6ddc2910c7f73bf76a2117d896bebac7ddcca9f329e54c01e025165bc

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