Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c77588a3539b20…

MALICIOUS

PDF

56.6 KB Created: 2020-07-20 01:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73c6a78be6b6e6dd4f3e32772fd4b6a0 SHA-1: 13fbed6d5c7f8419c56d4f8d86343f5ca4958f39 SHA-256: 24c77588a3539b20972dfd4cd819f863d3fe342e6ff3310918a16b0636a66a28
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, many of which point to a link farm designed to redirect users. One of the primary links leads to a known malicious redirector, 'ttraff.cc', which is likely intended to deliver a secondary payload or phish for credentials. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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/wb?keyword=treatment%20pulmonary%20hypertension%20pdf
    • http://files.mtviewcrc.org/uploads/1/3/1/8/131871515/dofebekuwosuxoka.pdf
    • http://files.medicinalthreads.com/uploads/1/3/1/4/131453136/041b67ba856.pdf
    • http://files.boondocksirishwolfhounds.com/uploads/1/3/1/3/131383826/8d21a64833d35.pdf
    • http://files.portagecentralexams.com/uploads/1/3/2/7/132740584/pisobujuzanekox.pdf
    • http://files.nowandzenyogawc.com/uploads/1/3/0/9/130969184/jirew.pdf
    • http://files.boondocksirishwolfhounds.com/uploads/1/3/1/3/131383826/8d21a64
    • https://cdn.shopify.com/s/files/1/0429/1218/6531/files/19767627527.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7218161301.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1264/files/kofisatovogopoki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0439/8183/2350/files/tuxafi.pdf
    • https://gazezoxasur.files.wordpress.com/2020/07/23150526140.pdf
    • https://zarulixapato.files.wordpress.com/2020/07/josigoboliditeze.pdf
    • https://pisurika.files.wordpress.com/2020/06/85071310813.pdf
    • https://nedigitupile.files.wordpress.com/2020/07/kiboxapovexofi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bepojarovizezeba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34993807018.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xumilegimazuguvabunozanik.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/85464713136.pdf
    • https://cdn.shopify.com/s/files/1/0433/0592/6809/files/dapod.pdf
    • https://cdn.shopify.com/s/files/1/0430/8674/1655/files/vupofoxepipexavuxagikazak.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6820/files/68655656477.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_off00009bbd.bin
83600304d02aae1cd5680532bc5cd6c3b4f8236dc5ca47381515fc6dd4e58de6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BBD 5212 bytes
font_01_sfnt_off0000ad44.bin
de533ebd150b8f917e495674ad31fcbe453b86beaeea6c479dad6a9b1f221eef
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD44 12308 bytes