Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5e460f4339b2a9…

MALICIOUS

PDF

33.9 KB Created: 2020-09-08 22:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a5e01c90e73c44473750aecc6c95ca4 SHA-1: 5467de30fbe1344219ee3aab5e4f43530946de48 SHA-256: 2e5e460f4339b2a9c4d681d4fbde6a79a492165accfa082de7d2d19ccb2bd0f3
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a chemistry test answer key. The document body and embedded URLs indicate a lure to a site that likely hosts further malicious content or exploits. The ML classifier strongly flagged this PDF as malicious, supporting the presence of a malicious redirector.

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.club/wix?keyword=chemistry+chapter+19+test+answers
    • https://cdn.shopify.com/s/files/1/0459/6075/7407/files/hallelujah_chorus_score.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/free_expense_tracker_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0464/9127/1320/files/gepixuxiworavibufed.pdf
    • https://cdn.shopify.com/s/files/1/0457/7588/0348/files/analysis_report_example_writing.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/participatory_rural_appraisal_methods.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/lapusogaxijez.pdf
    • https://cdn.shopify.com/s/files/1/0432/6260/7518/files/paderagaxojak.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9163/files/auto_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6073/9752/files/3612796105.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6615/files/payroll_system_report.pdf
    • https://static.usrfiles.com/ugd/b8c837_23f56fb7c5aa4f549d25ecc446686185.pdf
    • https://static.usrfiles.com/ugd/ef7b09_234fa8117d4542b7adf35cb657525fde.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045b2.bin
732bca59cd3914a9e837c0dd4c4d7eb4df9248617d57ab64b86c14826fa17d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45B2 5448 bytes
font_01_sfnt_off00005824.bin
e6b0433ddcd50fa98db81fec9f144321cdc7617fda6fb280fb65b3fe709f7a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5824 10160 bytes

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