Malicious PDF — malware analysis report

Static analysis result for SHA-256 b163d3e4879a686a…

MALICIOUS

PDF

41.9 KB Created: 2020-08-10 13:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b33a157ffd656a07db8fb53c06b0a2b7 SHA-1: 261d8667d59e4a517bf258582f1a2058dc7d25de SHA-256: b163d3e4879a686ad37f85326d3277b5cefcd2752e73db883f59cc9a11c7d7e5
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to external PDF files. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=pet+animals+worksheets+pdf', suggesting a lure related to 'pet animals worksheets'. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=pet+animals+worksheets+pdf
    • http://files.uniquelymecrystalsandtarot.com/uploads/1/3/2/6/132696104/9a41f6.pdf
    • http://files.cadblocksdwg.com/uploads/1/3/0/9/130969054/sedarixufo_dofupa_fogawubisivo.pdf
    • http://kivekirab.lovemyhealthybeginnings.com/uploads/1/3/0/8/130874431/c7d6e7.pdf
    • http://ledudego.feministforums.com/uploads/1/3/1/4/131410007/nedatujinudase_seluvowanol_nowaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6301/files/vejinubixujev.pdf
    • https://cdn.shopify.com/s/files/1/0429/1808/4771/files/95294926051.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4175/files/text_to_speech._types._voiceselectionparams.pdf
    • https://cdn.shopify.com/s/files/1/0447/8540/2013/files/important_questions_arithmetic_progression_class_10_with_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8892/files/10718840424.pdf
    • https://cdn.shopify.com/s/files/1/0432/4563/3691/files/72140039225.pdf
    • https://cdn.shopify.com/s/files/1/0438/5295/5810/files/acr_format.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/gumedukadixes.pdf
    • https://cdn.shopify.com/s/files/1/0435/8189/8913/files/dugusufulizujado.pdf
    • https://cdn.shopify.com/s/files/1/0434/5783/9254/files/91101629431.pdf
    • https://cdn.shopify.com/s/files/1/0440/0722/7542/files/gta_liberty_city_stories_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/jawesajuxamit.pdf
    • https://cdn.shopify.com/s/files/1/0428/6890/0006/files/21643794317.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_off000065a1.bin
850b661d2cb56f7886ad2c9e3a72bca2e3c24c9e765ba7842fbd954f28360166
pdf-font-stream PDF embedded font (sfnt) at offset 0x65A1 5436 bytes
font_01_sfnt_off00007801.bin
d895237c00b77319e0f69975d7ca6793aecfc9ef598773d035335aa6de528773
pdf-font-stream PDF embedded font (sfnt) at offset 0x7801 10132 bytes