Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd78ddf7fdcff3db…

MALICIOUS

PDF

44.0 KB Created: 2020-08-30 06:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a064bc09fa37541b530fc344578c1f40 SHA-1: fdf41e593b271daf88789ad9d48d4d37b02b9e22 SHA-256: bd78ddf7fdcff3dbe2a3392cb64c6e189da65e723686ce17cd350d878c0b976b
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to a link farm hosted on static.usrfiles.com. One critical heuristic identified a direct link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=lecturas+con+preguntas+para+primaria'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, reinforcing the link-based attack vector.

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.cc/wix?keyword=lecturas+con+preguntas+para+primaria
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/website_to_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1535/files/mesawuzat.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9158/files/65962438471.pdf
    • https://static.usrfiles.com/ugd/67f5f7_8b84e922a84440f693b3c43fa9afb5c8.pdf
    • https://static.usrfiles.com/ugd/e3325f_4f68e6cd3cf041acb4e5a57b60c2e92d.pdf
    • https://static.usrfiles.com/ugd/b8c837_980e1393dd6346279d5be4732cd1654f.pdf
    • https://static.usrfiles.com/ugd/fe83c3_d473836de4f2413c8339f33c79a6b698.pdf
    • https://static.usrfiles.com/ugd/3826db_b1c13fde08794472be3aabcb2c5b9502.pdf
    • https://static.usrfiles.com/ugd/865d50_a204e115f70a4fd991ce57fcbd625ec1.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8f9b1f3727c49e0a214c508011206bd.pdf
    • https://static.usrfiles.com/ugd/36f25b_aba99bcdee9c4b838256b24dff5bcb0a.pdf
    • https://static.usrfiles.com/ugd/735189_bce92f55c5604f80bda669d850a11094.pdf
    • https://static.usrfiles.com/ugd/b8c837_9083d8142d3d4032a29129d32455429d.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a625bdb0bbc4245b356fa1e0d79689b.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_off00006cdc.bin
2502bcc615154c38eb3c8ae10c5108bc1b82a82f9601e9e806014947f7ce3ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 5160 bytes
font_01_sfnt_off00007e54.bin
79115268e36ecb024907086a64c1ce4b63498cf74661340d910ab46147f84e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E54 11504 bytes

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