Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d684d9aedebde23…

MALICIOUS

PDF

45.5 KB Created: 2020-08-10 10:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a21718bd0fa505c90ff4c980d366e890 SHA-1: c858d0cf43eb50c3020c141b875535d313a80b4d SHA-256: 8d684d9aedebde23e157ec5ea2c0d75d237389ea72efd652c63448f31c48597d
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though partially corrupted, contains text related to 'convert vertex form to standard form worksheet pdf' and includes the malicious URL. This suggests the document is designed to trick users into visiting malicious sites, likely for phishing or malware distribution. No scripts were extracted, and the primary malicious activity observed is the redirection to a known malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=convert+vertex+form+to+standard+form+worksheet+pdf
    • http://files.fxpasselegue.com/uploads/1/3/2/6/132695865/gikajimekanavuxu.pdf
    • http://files.hvaillancourt.com/uploads/1/3/0/7/130775373/robepe-repasam.pdf
    • http://jamoro.bolstersunderway.com/uploads/1/3/2/6/132696030/2103502.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/industrial_toxicants.pdf
    • https://cdn.shopify.com/s/files/1/0439/1269/1867/files/dabimulukavufulawulu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/jilipeditovexe.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/50062194860.pdf
    • https://cdn.shopify.com/s/files/1/0435/4893/4295/files/actex_manual_exam_p.pdf
    • https://cdn.shopify.com/s/files/1/0431/8088/4129/files/vigakofavojazi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/83583068491.pdf
    • https://cdn.shopify.com/s/files/1/0439/2130/9851/files/asme_b36._10_latest_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/8307/9588/files/14136609570.pdf
    • https://cdn.shopify.com/s/files/1/0434/5482/4598/files/sedoranupujijotofituvoto.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/8730835188.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_off00006ad9.bin
6605c83c14d7b571a6f2432741e6f2fedde3874ba2498d7198fe6422f839b99a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD9 5436 bytes
font_01_sfnt_off00007d47.bin
ae0425908c65087a39d44185e3c43fe73da73958d62b81edbecb62454d5faa30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D47 13952 bytes

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