Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1973114750b77b7…

MALICIOUS

PDF

40.7 KB Created: 2020-08-08 15:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 559b02688ccc402ebda6a6774f52a7fc SHA-1: 2e5cd11055721e1797997dc070923de4ded16d39 SHA-256: a1973114750b77b74e7180b3a57f0acdb4bbcf140c444177261f259b7d53abbc
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, suggests a lure related to a medical condition ('Ruptura de aneurisma abdominal pdf'). The heuristic firings indicate the PDF is designed as a link farm, likely for SEO poisoning or to redirect users to malicious infrastructure. The primary malicious IOC is the redirector URL.

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=ruptura+de+aneurisma+abdominal+pdf
    • http://suberan.thequeensfancy.com/uploads/1/3/2/6/132696194/namojomedutowi-tazugovototeda-xalosuwitaj-sowebe.pdf
    • http://files.preciousmomentslivebymichelle.com/uploads/1/3/1/1/131164009/ccf5ad95b9a5.pdf
    • http://files.alexstudio.bg/uploads/1/3/1/1/131164448/875fbb5e4c12d5.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/73845531714.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/redukenedobitaguwowok.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3320/files/xipotobenu.pdf
    • https://cdn.shopify.com/s/files/1/0448/6758/4162/files/estrategias_de_enseanza_aprendizaje_segun_autores.pdf
    • https://cdn.shopify.com/s/files/1/0436/3563/8425/files/71227307193.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42632515291.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/840636396.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/xusewedetabebopatesis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9575/files/joderubobuninusilekevo.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_off000062b0.bin
a59a624b4a60bef2d730626da5973285c5b859bc95c6bf4cb75a5bd66c4c3ca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B0 5332 bytes
font_01_sfnt_off000074b6.bin
ad9ea95754b8cc1ceb97d90f514b3c1e3a2f4117e19b32a19a389a17e08c1102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B6 9780 bytes

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