Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b9618ffa180dd0…

MALICIOUS

PDF

39.0 KB Created: 2020-10-09 05:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 70fe7157cf94a98aafc7928a8a06e95c SHA-1: 6ebd516bcfeeca5218e316773f5b6ab9a7081691 SHA-256: 99b9618ffa180dd0afd805a684bf2c7ddb76c77d65e59641c319a7f6f9900a64
124 Risk Score

Malware Insights

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

This PDF document contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though partially obfuscated, includes the URL 'https://cctraff.ru/pify?keyword=baby+sun+conure+for+sale+uk', suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly flagged this PDF as malicious.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=baby+sun+conure+for+sale+uk In PDF document text
    • http://getibe.pmrfirstthirdresources.ca/uploads/1/3/1/1/131163635/polagukiwejivo-karusumines-wikofitevilav.pdfIn PDF document text
    • https://site-1038343.mozfiles.com/files/1038343/kuwigufuwobejarafam.pdfIn PDF document text
    • https://site-1039351.mozfiles.com/files/1039351/63871783835.pdfIn PDF document text
    • https://site-1038636.mozfiles.com/files/1038636/voteluvilesuvumi.pdfIn PDF document text
    • https://site-1039644.mozfiles.com/files/1039644/69375582162.pdfIn PDF document text
    • https://site-1038880.mozfiles.com/files/1038880/58850002220.pdfIn PDF document text
    • https://site-1042102.mozfiles.com/files/1042102/dofuduwubozugivu.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/80becc0d-df49-494d-89e8-d9ff45a192c7/43719071779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53cd9664-6ae6-4901-8298-1701c348a299/wibulajugabumabaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2b8ecc9-db92-4ed5-8639-ba09f663e30a/wakidusume.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_off00005b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B2D 5228 bytes
SHA-256: 6d5f670588614baa34bc851986362a1b6b79d27163866ecfc73538d8834ed27b
font_01_sfnt_off00006d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D15 10100 bytes
SHA-256: fd8d79d550be64091808dc6d9726030129fb49b448129ad8e5f966ff8f1b1b0b

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