Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb2711aa5b7b34c…

MALICIOUS

PDF

49.0 KB Created: 2020-08-03 23:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b658adb08b0d87a0ae488b816608ca2d SHA-1: 1cde1e8d420c4dcb4ec37cc709dba7a848da650a SHA-256: bbb2711aa5b7b34c494fb92fb3a54ad57653e897eeedf15c96f5446592ebc514
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL `https://ttraff.ru/pify?keyword=despu%25C3%25A9s+del+liberalismo+pdf` is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure. The ML classifier strongly supports the malicious verdict.

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.ru/pify?keyword=despu%25C3%25A9s+del+liberalismo+pdf
    • http://files.titleny.com/uploads/1/3/1/0/131070072/2476601.pdf
    • http://files.epsilonkappatx.com/uploads/1/3/2/7/132712530/wopopebuduw-nepow-daluw.pdf
    • http://files.harmonizeyourspace.com/uploads/1/3/2/3/132302913/6922088.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/gedewupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7630/5564/files/zumiwutumuze.pdf
    • https://cdn.shopify.com/s/files/1/0438/0635/9713/files/malukusagaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/hosts_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/95718456578.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/8006/files/67304776311.pdf
    • https://cdn.shopify.com/s/files/1/0433/7428/0855/files/94303402788.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8209/files/11650588576.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/45780958603.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/irc_channel_for_textbooks.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8090/files/luzusis.pdf
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/bopitigofugumejuzeke.pdf
    • https://cdn.shopify.com/s/files/1/0430/8818/3447/files/65843140573.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/
    • https://cdn.shopify.com/s/files/1/0428/7630/5564/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d75.bin
272001d8c59417002b35dfd8d7a08db2280ead24dee2b58aeac0067b5c957c5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D75 5468 bytes
font_01_sfnt_off00008fab.bin
bd66d79ea1ad07f1b380ed68921b782d0993ce913db82dae2588ebaeeb438bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAB 11544 bytes

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