Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a16162afad6c143…

MALICIOUS

PDF

43.4 KB Created: 2020-08-31 03:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f2e3c44af5ebee7d5c0f3cd294b1651 SHA-1: f263b6f29750f714f62aac9693f7453625b9b0ea SHA-256: 1a16162afad6c1430b0c2677b1fb3751a8dfdfb3ce8d7eea0555ff734a59d432
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, a technique often used for SEO spam or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/wix?keyword=weed+30+thc. Another heuristic flagged the PDF as a link farm, with numerous links pointing to shopify and static.usrfiles.com domains.

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.ru/wix?keyword=weed+30+thc
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/kujixakazidetulixubufa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/arboles_de_decision_finanzas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0435/0800/7072/files/converse_inverse_and_contrapositive.pdf
    • https://static.usrfiles.com/ugd/b8c837_97ced84cf33f4380a7f992ef97d4d2bd.pdf
    • https://static.usrfiles.com/ugd/7ff653_824f87e95d304190a2bd58853933b3c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_5769e1b7c6f04deabef1f2ef0e60a801.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1b07e5cc80f421399e748d3e082ab2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_8858d9293e914f639ef3c5e852b4a3c4.pdf
    • https://static.usrfiles.com/ugd/a107db_0b3a18a723f84bc08de2f03a28a01e42.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ba49b58ce7449a587958b952fcb2dcc.pdf
    • https://static.usrfiles.com/ugd/33ab24_6ab4f5c9f72746c8b23e2646d46fe111.pdf
    • https://static.usrfiles.com/ugd/e4ff69_d9555754ddfd43f795c686100a4c4392.pdf
    • https://static.usrfiles.com/ugd/45e30f_a10b0d8a66d34292aa17b10d0a16b8cf.pdf
    • https://static.usrfiles.com/ugd/a107db_f82c85d68c8244d4ad74a92e56e00761.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
545d5ca9b975f69e676bb8f11dab12aaa8dde02195b3568d22ecfac794f840cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDC 4828 bytes
font_01_sfnt_off00007d5b.bin
1a80dcf78383ddfc7177317818abffb01785a77161bd22085e0c787359ad1f4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5B 10432 bytes

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