Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a537552cb42d1a…

MALICIOUS

PDF

51.7 KB Created: 2020-08-18 20:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a118f921443e58c9945730e5ebf40cf SHA-1: b963c1af9e265def9a345be66eb57c1b947aecff SHA-256: b4a537552cb42d1a6d466a1dc0a665b01029ff733396c71c5fd7b340317d1c5a
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and references to 'wkhtmltopdf', suggesting it was generated programmatically. The presence of numerous links to Shopify-hosted PDFs, while some are benign, indicates a potential link farm or SEO manipulation tactic. The primary attack vector appears to be social engineering through a deceptive document title and a malicious redirect.

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/pify?keyword=conditional+probability+questions+and+answers+pdf
    • http://files.suburbanhennepinhousingcoalition.com/uploads/1/3/1/3/131380354/9726478.pdf
    • http://files.matrix-leadership.com/uploads/1/3/1/3/131398093/9742476.pdf
    • http://files.wrangellboatshop.com/uploads/1/3/1/8/131856232/wupawatotaf-tejobetoxanepaw-tagaj-jijevexumajife.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/xafufaladerorifulid.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/xazupupilotukejoso.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/48220163780.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7605/files/21072893751.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/how_to_delete_all_tweets.pdf
    • https://cdn.shopify.com/s/files/1/0437/1152/9114/files/kuxasivizaxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5071/files/fuwutinut.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/appel_d_offre_informatique_quebec.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/zozokapis.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0317/files/risenurebolikesuxerini.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c7e.bin
4da88dff65ea83138bfc68e45691aeeb35294fea09ad20504c47d2d5321248f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7E 5400 bytes
font_01_sfnt_off00007ef3.bin
78506141afa86490342c6be65cd2674a69519dd8090b2dd136d2abd690e265f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF3 14344 bytes
font_02_sfnt_off0000ac6c.bin
6bfd663be811f4c0caa16031a69679ba2b5a79eca72185f30448f1bd3e23166d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6C 16112 bytes

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