Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed4bc62b1f557f1…

MALICIOUS

PDF

48.6 KB Created: 2020-08-30 02:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dee8fd17e48aebcd7d9f604b8a307106 SHA-1: 7ecd3b995bd1e332a8f92d1e1384615403dec049 SHA-256: 9ed4bc62b1f557f1dc909d407c37ffb775079761cee40e34596ca37c1f43f5e6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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 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://ttraff.com/wix?keyword=cancionero+cristiano+con+acordes+para+guitarra+pdf In PDF document text
    • https://cdn.shopify.com/s/files/1/0445/3348/1636/files/barthes_s_z.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/dukikalivasokenepadu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/97473048867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5358/0437/files/vokise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/kasuwawunukofojazubiv.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_3003a8fbfa364b62989e451aa61fb442.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/784815_22bf8474de85416d83eb30240ad782f0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/3621/6229/files/wii_point_generator_no_survey.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/2765570687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/8523/5111/files/adobe_reader_apk_latest_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5195/6894/files/15580870594.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7923/6774/files/telecharger_journal_el_watan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vojinanekarab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/9073/9099/files/sample_case_study_format_special_education.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074ed.bin
2890630018726ed389929dd071ade7080840edc3c52efa40dc705e8ad8c52b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74ED 5196 bytes
font_01_sfnt_off000086a3.bin
139cb24750fa9b229eff3f2d89fe45df85066e3127fba5f5260fe1f90d3ee934		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A3 14684 bytes

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