Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25144ce5ce28c86…

MALICIOUS

PDF

39.5 KB Created: 2020-08-23 15:39:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03d8ed3cd9eac9e73ef8876deaf163c2 SHA-1: f220ff42b0042f40c94d9aee233fc4ca175cff11 SHA-256: b25144ce5ce28c867b64de9d882e3bb49fd16563603a2c61689633cc326c5768
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=clear+cookies+and+cache+google+chrome+android', which is a critical indicator of malicious redirection. The presence of numerous links hosted on cdn.shopify.com suggests an attempt to disguise malicious activity within a large number of seemingly benign files.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=clear+cookies+and+cache+google+chrome+android
    • http://files.rumahbudayaindonesia.org/uploads/1/3/0/7/130739227/wupipefegulefumenisi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/fosujujam.pdf
    • https://cdn.shopify.com/s/files/1/0437/6828/3287/files/tipevevorutozalajulose.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/40779171909.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6157/files/42509386608.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/acknowledgement_for_ojt_narrative_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/sookie_stackhouse_book_order.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6486/files/2020_nfl_bye_weeks.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/94613028643.pdf
    • https://cdn.shopify.com/s/files/1/0432/7804/1244/files/54992238686.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3355/files/mushroom_kingdom_fusion.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_off00005c21.bin
bd53472e165fc718adedadbe4e00bb940afe82ac652ba6ac344f6525b0389d69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C21 5320 bytes
font_01_sfnt_off00006e04.bin
d23ca66f67e6ac02d32c42bd9a4f0caa57c1855a79e15c3322619aa2a1332bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E04 10248 bytes

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