Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c77741d4df706c…

MALICIOUS

PDF

43.1 KB Created: 2020-08-03 18:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db64510a472e5b9f86edd09b48a952a8 SHA-1: 72d44ef5a7ea64f6cf2039e9f13fe67ac9d6bbba SHA-256: d3c77741d4df706c7cf90977077717cccdcb8742e46befc66984ca8dff775b89
128 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the same malicious redirector URL and several benign-looking PDF links, suggesting a lure to download further malicious content.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=systematic+review+example+pdf
    • http://files.tournoidevignoles.com/uploads/1/3/1/8/131856290/mabutimeparos-konakemit.pdf
    • http://files.theworldaccordingtojake.com/uploads/1/3/1/8/131871433/menadob.pdf
    • http://files.crazycurrchic.com/uploads/1/3/2/6/132695832/3ccfaeab5d.pdf
    • https://cdn.shopify.com/s/files/1/0436/9724/2280/files/67516684463.pdf
    • https://cdn.shopify.com/s/files/1/0432/2308/9307/files/wuwaxefov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4551/files/57422492230.pdf
    • https://cdn.shopify.com/s/files/1/0437/4590/2746/files/kewitudinosesosexukerik.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2038/files/41383004020.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/91185727892.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8106/files/95009648775.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15906675896.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/8430163173.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/lokexatavul.pdf
    • https://cdn.shopify.com/s/files/1/0432/8679/0304/files/18007032001.pdf
    • https://cdn.shopify.com/s/files/1/0432/5412/0606/files/37458794091.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_off000069ae.bin
f53d671f327702da4df531f8fb46968624a13ce2917441cb11acb26e0cebbdfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AE 5724 bytes
font_01_sfnt_off00007d31.bin
d6b65b46c32bf00db87164e943a4282e1dad1d3bce4df6b08d2e56dc0ee5aa5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D31 10028 bytes

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