Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dbf2d1cd0e912c…

MALICIOUS

PDF

53.4 KB Created: 2020-09-18 13:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b071808979590068706041eb4a7b9c2 SHA-1: 0790b755df187c42d7f8a3bcf0d0ce8ed2cafc04 SHA-256: 51dbf2d1cd0e912cfd2e2dbf07570d1d5c8d2d4b2de0ca784a3bc00cabc57f6e
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to a malicious redirector, disguised as an educational resource. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the embedded URL https://ttraff.link/wix?keyword=algebra+1+regents+study+guide+2019 is the primary indicator of compromise. The PDF also hosts a large number of other links, as indicated by PDF_SEO_LINK_FARM, suggesting a broader campaign to distribute malicious content.

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.link/wix?keyword=algebra+1+regents+study+guide+2019
    • http://files.hcmsystemslimited.co.uk/uploads/1/3/0/9/130969160/gexeloma.pdf
    • http://tikibamoj.governmentinformationday.ca/uploads/1/3/0/8/130874431/nifoviledinabu.pdf
    • http://files.mutualaiddisinfection.org/uploads/1/3/1/4/131411474/laradokijadevoliruba.pdf
    • http://laguwadu.eacislam.org/uploads/1/3/1/1/131164312/38012be.pdf
    • http://files.alone-together.org/uploads/1/3/2/6/132681625/9016287.pdf
    • https://cdn.shopify.com/s/files/1/0433/9538/3446/files/63103262708.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61411835552.pdf
    • https://cdn.shopify.com/s/files/1/0438/0295/1842/files/decimals_multiplying_worksheets.pdf
    • http://files.alinken.people.ua.edu/uploads/1/3/0/7/130739678/f467322b73a.pdf
    • https://5212716a-a33c-4fb4-b666-8f4dcf71a22e.filesusr.com/ugd/a13bc2_336eb0c7c0b848f68151b2f6e2a5ed81.pdf?index=true
    • https://fc8bb3b8-2e6d-4428-8407-9d28e7f4dbe4.filesusr.com/ugd/d4579c_624ca246af094f66b8922e413a6e4e82.pdf?index=true
    • https://5a318801-ac99-4025-98e3-fc62830738ce.filesusr.com/ugd/97aff7_8913ca5cabeb469384d24b8a094c7cec.pdf?index=true
    • https://215c2c23-048b-4af6-8247-c16cc51c60b9.filesusr.com/ugd/9ced5d_accc0bc098964d57b98ff74b37392c84.pdf?index=true
    • https://5f507078-8ddf-456c-8820-b1880fcfeba4.filesusr.com/ugd/f96b02_6be1d6ba4b2b42bcac7dffa3cbcbc378.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008282.bin
b70445fc164973719d3b378b60c40a6b077974595fe63a0e92daf4fd47ec92e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8282 5480 bytes
font_01_sfnt_off00009529.bin
5e5b98d208e624d89f29482fd03653ca739f83c74486f83a2d882aac184a5dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9529 10964 bytes
font_02_sfnt_off0000ba78.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA78 4324 bytes

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