Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8251172eaaf7ca…

MALICIOUS

PDF

40.9 KB Created: 2020-10-06 19:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bc3b43c3c7acbbd88f5380f859b14d52 SHA-1: ed48aef80cd4d914bd62f2cc8d713f1d70a5857a SHA-256: cc8251172eaaf7cad546c579daf0f96934b3fca322d5fecbea19cec98b8809ef
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a manual and includes URLs that are likely part of a link farm designed to distribute malware or lead to phishing sites. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

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://gettraff.ru/strik?keyword=epiphone+studio+10s+manual In PDF document text
    • http://files.pennybrittenphotography.com/uploads/1/3/2/6/132682913/doleripifeza-fobuxawasamuxil-bufipate-vorawu.pdfIn PDF document text
    • http://files.bg3v3nicolet.com/uploads/1/3/0/7/130776542/6614550.pdfIn PDF document text
    • http://files.highflyerseducation.com/uploads/1/3/1/3/131380337/ffdb3.pdfIn PDF document text
    • https://site-1037191.mozfiles.com/files/1037191/6137000507.pdfIn PDF document text
    • https://site-1037175.mozfiles.com/files/1037175/kamesupudanezo.pdfIn PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/24738418110.pdfIn PDF document text
    • https://site-1039995.mozfiles.com/files/1039995/regapomuvujefusifud.pdfIn PDF document text
    • http://zekokif.goldenreiki.co.nz/uploads/1/3/1/4/131438304/dorebevofejinezeg.pdfIn PDF document text
    • http://zudixa.smyrnafoundation.com/uploads/1/3/1/4/131453501/6c7bc4e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7397/8011/files/39585932827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3242/0250/files/wexolatibidalo.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_off00005982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5982 5252 bytes
SHA-256: ca579ef20bee98c3515f1cc759706f74f867d624a6e50f7d2b816450aa610d78
font_01_sfnt_off00006b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3D 14208 bytes
SHA-256: 10d2eefcb81cd8a57b23d1eec73145377a243eebe5ccbb7eb41ccb81187f4ddc

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