Malicious PDF — malware analysis report

Static analysis result for SHA-256 57cc9cad33cae1a8…

MALICIOUS

PDF

98.8 KB Created: 2020-08-29 17:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4dc0b4b1466c0b58f793f6c5db28af3 SHA-1: ce3d28f8877aab8360efb9b3885ea288018d6974 SHA-256: 57cc9cad33cae1a8770d9365ae8ace3f0edeb5c850bd406ff5567ead329e0e0f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The primary malicious URL identified is https://ttraff.com/wix?keyword=introduccion+a+los+negocios, which likely serves as a redirector to further malicious content. The document body contains garbled text but also includes the same URL and other benign-looking PDF links, suggesting an attempt to disguise the malicious intent. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=introduccion+a+los+negocios
    • https://static.usrfiles.com/ugd/0dd040_af427532270e4d059d3f1bcb44992b1d.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_83fc0f75b38245338e87e533be8e6a3c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3daa7cc62bae48708f7609399e071a1b.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2472/files/80054096530.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9142/files/metal_gear_solid_alert_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0432/1610/9736/files/tuwebume.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53975554289.pdf
    • https://static.usrfiles.com/ugd/b8c837_267a8b1477954d6d8ef18fa287a6adab.pdf
    • https://static.usrfiles.com/ugd/6da380_a4f63928d4274cc4b9a46689cb6464ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8cb6a49217443a2bd38dc59a5914f8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d57c29cfbea74b18957df0616ed1d60c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74195332560.pdf
    • https://cdn.shopify.com/s/files/1/0454/1834/8712/files/gta_vice_city_unlimited_money_cheat_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9385/files/xaxifufirupizusodedew.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_off000136c5.bin
9c3b766da0373c3e6e63ec75cedb8c52a04cd0de50f1ae3b4261e76eddc30d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136C5 5044 bytes
font_01_sfnt_off000147ec.bin
827544dfd73a900c9e43bde192f55f94870b97ca126863c348236ee5453ded26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147EC 17772 bytes

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