Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d0b4b2655be81a…

MALICIOUS

PDF

115.9 KB Created: 2020-10-28 13:29:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9dbc0d797403cacad6ca53095196791f SHA-1: 39567f6b5a19656227c49f7d3269939efcdc3bc5 SHA-256: c6d0b4b2655be81a091be0701cf931ac17d53f1902c63cb27b3f8395f2cee3d1
194 Risk Score

Malware Insights

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

The PDF contains numerous links to redirector domains, including one that impersonates search results for 'kingdom hearts characters ages'. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests a phishing or SEO scam. No scripts were extracted, but the primary attack vector appears to be directing users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=kingdom+hearts+characters+ages In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f924b961902b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5f9781aeb4d6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380211/normal_5f91ba86d8e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402488/normal_5f90e1498f5ec.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/kesirawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5f8c84895429a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_5f9452fb07842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369920/normal_5f899fa580ac7.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/24e248e6e441.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_5f9359ae2f797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_5f8c0ddd44b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f95b3a78350f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420775/normal_5f98c9d97ca82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_5f99445e85e44.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/mokuwanibof/kinds_of_adverbs_worksheets_for_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/accounting_principles_101.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/what_does_it_mean_to_be_alive_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/worthy_of_it_all_chords_f.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/70117392673.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/que_es_la_arquitectura_organica.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E43 5628 bytes
SHA-256: ec56790e5d8ddb4453cb757c64a1029a0670f5b2404c1078fa399d0001884268
font_01_sfnt_off000171cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171CF 5292 bytes
SHA-256: 566d0a3dbdca911123f8a8e3bae081b88405fc53789058629b8501383fa1996b
font_02_sfnt_off000183a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183A7 12472 bytes
SHA-256: 7a6799a85209ac3230691e8e82c602b53198815f019a82e271f167b4412cc163
font_03_sfnt_off0001abf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABF6 16060 bytes
SHA-256: eb67323a3edc51f073cf7ae7c668a4400309481d93a41d1ca3bfc03d889966df