Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc48fab7efb0acb5…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 12:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db50a48b5a5edd2760dff5bb43ddc293 SHA-1: e0b0ea7c91979e433a0e9b10eed5f982eec67b04 SHA-256: dc48fab7efb0acb5546c2a4de707d11ea6ed3f5ab10153d79e902e0a21f42069
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lead users to malicious content. It also features a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector and the link farm indicates a phishing or redirection attempt.

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/wix?keyword=blank+printable+game+boards+free
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/nobomanutefebomabovu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1461/8277/files/integral_of_trigonometric_functions_problems_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/33267883914.pdf
    • https://cdn.shopify.com/s/files/1/0431/7783/6703/files/anatomy_and_physiology_for_dummies_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/8743621486.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/61741181463.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/xuxifirusabadoja.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/cancer_gastrico_celulas_en_anillo_de_sello.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/88610097209.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4325/files/mapibatitomeliwokusi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5501/4298/files/8360274817.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_off00006227.bin
990e1e5d06f4a4492d7f5eaa188fe0606c6e6341104f47df9439785162bcba42
pdf-font-stream PDF embedded font (sfnt) at offset 0x6227 5612 bytes
font_01_sfnt_off0000751f.bin
f449cb87ed04634c8cf4078b31fcca370a9000623967f7d368cff19e54555e7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x751F 10108 bytes