Malicious PDF — malware analysis report

Static analysis result for SHA-256 935aa13d99e2a29a…

MALICIOUS

PDF

48.1 KB Created: 2020-08-06 07:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71e1b9b04693925b7adb8a09579e5b0d SHA-1: cefeb762a236b5ec34d2b0795478a23cacb2e5b9 SHA-256: 935aa13d99e2a29ac4e4a8760ff6b60c1764f8f61f6b12da054e606969ae7cb3
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used to create link farms for SEO manipulation or to redirect users to malicious sites. One critical heuristic identified a link to a known malicious redirector, 'https://ttraff.ru/pify?keyword=carbs+food+list+pdf', which is presented as a 'carbs food list pdf'. This suggests a social engineering attempt to trick the user into clicking the link. The presence of many Shopify-hosted PDF links, while individually benign, contributes to the overall suspicious nature of the document as a potential link farm.

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=carbs+food+list+pdf
    • http://files.robinsongolfart.com/uploads/1/3/0/7/130739059/71b5cfd32e.pdf
    • http://files.152811427883146431.com/uploads/1/3/0/8/130814926/ecf835.pdf
    • http://files.shoptaorminajewelry.com/uploads/1/3/0/7/130776276/wadumidosoxixowapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3980/files/ruzodujasuxitazakemosusax.pdf
    • https://cdn.shopify.com/s/files/1/0429/6350/1222/files/kajigusotonozezetixap.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/34011522767.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kozaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/zekamaredovogokufubu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3535/files/64821835923.pdf
    • https://cdn.shopify.com/s/files/1/0430/8513/6021/files/kuwem.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/50605010046.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5534/files/zajituzumi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/76736908383.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/70478336247.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/nevapamiwefadeva.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_off00007e74.bin
1674bc914e50f981659f15636074cc256c1db1987b7d439fc4008a33cfae4d69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E74 5080 bytes
font_01_sfnt_off00008fba.bin
a928e07ed7fe064976ded49325f6cb5a26a2154d17fa95133e1f7592213e0c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBA 10500 bytes

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