Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a4b3c9e8e694b8…

MALICIOUS

PDF

40.3 KB Created: 2020-09-18 16:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 003efcbc8d5da1634d00781ee5aad92f SHA-1: 7257cc3f75ce2fa9f515a80351250cb20d061c83 SHA-256: c4a4b3c9e8e694b8a18c9cce1e17fc6489a20fe291d9dbd4005fa587bd4bb1b3
150 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.me', identified as a malicious redirector. Additionally, it features a large number of embedded links, many pointing to external PDF files, suggesting a link farm or redirection strategy. The document body, though heavily obfuscated, also contains the 'cats mod apk revdl' string and the malicious URL, reinforcing the lure. The ML classifier also flagged this PDF with high confidence.

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.me/wix?keyword=cats+mod+apk+revdl
    • http://vipowoxoz.pioneervalleykennelclub.com/uploads/1/3/2/3/132302842/zonadonan-kotemafidu-komolibur.pdf
    • http://pogeriv.offonatangent.co/uploads/1/3/1/4/131437252/lulej.pdf
    • https://3cea1a01-ab32-4d4d-a3c3-b6ec83edd9e3.filesusr.com/ugd/5c9621_c9a536be4af14a54ac309f4b4d8594e7.pdf?index=true
    • https://d8df5c7e-de38-44ab-a08a-04173e0aa642.filesusr.com/ugd/8a4248_6855863fa89e4550a206b8f4eea98933.pdf?index=true
    • https://73f8243a-b880-4747-9c73-a266223052b9.filesusr.com/ugd/0cd3a8_166acca2f6d24fb3ad07e13d6dee11d4.pdf?index=true
    • https://c96d87c1-7cc2-4550-b507-94493d2ac5ed.filesusr.com/ugd/941881_63d94045ccd94472bf271f2a6978aba8.pdf?index=true
    • https://32edf4fb-5f82-4150-b6d1-5007191e4b46.filesusr.com/ugd/275374_1c5085109d5842b6bc3170bd06845a9b.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/15109650679.pdf
    • https://cdn.shopify.com/s/files/1/0437/2683/1784/files/60629739852.pdf
    • https://cdn.shopify.com/s/files/1/0433/8617/5651/files/fusionner_2_fichiers_en_ligne.pdf
    • https://fbc10157-f3d0-421c-b2d0-f7eda5aaa84a.filesusr.com/ugd/9b33c5_78d463cdbbeb410296da37dc9e0239d8.pdf?index=true
    • https://5547104c-df1b-4542-9008-737fe9efe1dc.filesusr.com/ugd/17159d_46e0df2b5556490db4445c82418cf44c.pdf?index=true
    • 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_off00006009.bin
dd81eaee2f523b9bff33a34fc3b8916816121516a212e01db1ff1ff06de002e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6009 5136 bytes
font_01_sfnt_off0000716e.bin
e9844bbb60479464714d65dd1e84e2a3a1eb05f4a0bca36b4866844f5764b657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x716E 10424 bytes

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