Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36a8afd51d1d4fe…

MALICIOUS

PDF

44.1 KB Created: 2020-08-10 09:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 148766dbf46a5af5102626f0e75c7470 SHA-1: 509360b533697e72d02aa81c6dd684fcf84f90d8 SHA-256: c36a8afd51d1d4fe00c305915a2f3052b61b0669ff2a4e4a7707e04c47adcaa1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text referencing "cissp exam questions 2020 pdf" and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on cdn.shopify.com, which are likely part of a link farm to improve search engine ranking for malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious verdict.

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/pify?keyword=cissp+exam+questions+2020+pdf
    • http://files.carlapasqualini.com/uploads/1/3/2/3/132302923/e493ba1df856.pdf
    • http://files.kawarthatruthandreconciliation.ca/uploads/1/3/0/9/130970009/niwipadekotomigufabu.pdf
    • http://files.gstrackers.org/uploads/1/3/0/7/130740264/gaminepugusifola.pdf
    • http://files.changingleaf.ca/uploads/1/3/2/6/132695438/pixozomibubab.pdf
    • http://files.gstrackers.org/uploads/1/3/0/7/13074
    • https://cdn.shopify.com/s/files/1/0450/5364/0856/files/j_cole_breakdown.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/54609456376.pdf
    • https://cdn.shopify.com/s/files/1/0431/9766/1348/files/remove_annotations_from.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/bolt_connection_design_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/43903805061.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/7434521539.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/wojurexu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/pilegizonesemesefopopilu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8807/7209/files/46811513945.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/5992390233.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/zovutuzere.pdf
    • https://cdn.shopify.com/s/files/1/0431/7242/9980/files/19750210097.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_off00006e6c.bin
535f039839f75dbcac2cf5fc9f8591483b03b06329126d571f0f4424e4b1b4f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6C 5432 bytes
font_01_sfnt_off000080de.bin
9bb88f7a600a2eaa76f64711eeab9a4b9c220791e848f0f79e3781dda6f85bb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DE 10180 bytes

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