Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fb425e176ae785…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 11:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33a4ea19b9f9b9c6c164ea6b019fe145 SHA-1: 2818a3e104971245a8db8770c83c5fa22e89f81a SHA-256: 21fb425e176ae7851f16b8a5b4283949864aa56d77ad3589fa66412d84c0b0aa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=adjektivdeklination+pdf+%25C3%25BCbungen. The document body, though heavily obfuscated, contains references to this URL and other Shopify links, suggesting a link farm or redirection scheme. The ML classifier 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 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.ru/pify?keyword=adjektivdeklination+pdf+%25C3%25BCbungen
    • http://rizegale.subudbooks.com/uploads/1/3/1/6/131637016/95a0c3362f66c0c.pdf
    • http://files.hazelandzadiegifts.com/uploads/1/3/1/3/131380052/09b7c7ca9c.pdf
    • http://files.primitivedreams.ca/uploads/1/3/1/4/131483361/gukemuxunakun.pdf
    • http://files.ecigsuperstores.co.uk/uploads/1/3/1/8/131872273/1c5b38d9.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4592/files/59168632331.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/causative_upper_intermediate_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0971/files/goxorewajevadizajud.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/what_timezone_is_california_in.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/27250628103.pdf
    • https://cdn.shopify.com/s/files/1/0428/9282/0643/files/35983926659.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/48075529119.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0435/0532/0088/files/terodesutuxurinekuwivar.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2613/files/kusaderivoxagaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4986/1791/files/65025412015.pdf
    • https://cdn.shopify.com/s/files/1/0428/0241/3735/files/5e_monk_way_of_the_long_death.pdf
    • https://cdn.shopify.com/s/files/1/0428/7604/3423/files/pasutas.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_off000060b5.bin
9aaf2f4efcb444805a43dd68630547d5ca17b257c525032a4fd47141fe3c0283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B5 5384 bytes
font_01_sfnt_off000072f8.bin
2a51e1c17cd41ca2d62180e2ac582aad169d39861a9cb2b48a1be99000fb5a0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F8 11428 bytes

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