Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfff5d235d739ab…

MALICIOUS

PDF

40.0 KB Created: 2020-08-19 05:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a69c08e4acfd0c46512640f67530b1d SHA-1: eb213c55912a7690bfde3ae090a17f632bed805a SHA-256: 9dfff5d235d739ab5fb2a060f016ac7e8808c4baef5816bca27816f82063e753
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are hosted on Shopify, but one critical link redirects to a known malicious domain (ttraff.cc). The document body, though heavily obfuscated, contains text referencing 'Uc browser free apk pc' and the malicious URL, suggesting a lure to download potentially unwanted or malicious software. The presence of a malicious redirector link is the primary indicator of malicious intent.

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/pify?keyword=uc+browser+free++apk+pc
    • http://files.recycledmindsimprov.com/uploads/1/3/1/3/131383651/pesonet_vidizawatadewa_tezidarul_mojesaririv.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/namakam_chamakam_telugu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/uva_darden_employment_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5265/files/android_emulator_proxy_vpn.pdf
    • https://cdn.shopify.com/s/files/1/0446/2352/8099/files/91510612422.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/periodicity_ncert.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/44401550624.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7431/files/22943647481.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rokagarunawawutasa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5241/7703/files/guxidedufujizudizodijov.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_off00005d53.bin
cd3e843731c0b90518333a15043070f7433f9ddd09db1ffd4b90040e679c1f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D53 5264 bytes
font_01_sfnt_off00006f5c.bin
14f0b87a67a03425f57b0033f67d1eb1bebf99fc37d620bdba49fca855e2ba59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5C 11324 bytes

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