Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99f81625ac9a344…

MALICIOUS

PDF

41.3 KB Created: 2020-08-18 15:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b82cf573cfa887d138f78695a8c79d90 SHA-1: e2d2e5018c9b9fcf6aa20186a29dbfda51dd803f SHA-256: a99f81625ac9a344296571d268a9b69af4b64c5e73bad4f46efef2cfda2fb8b2
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL 'https://ttraff.cc/pify?keyword=root+explorer+android+app' is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other Shopify URLs, suggesting a lure to download an application or access external content. The ML classifier strongly supports the malicious nature of this PDF.

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=root+explorer+android+app
    • http://tuxipapuk.goldendaleobservatory.com/uploads/1/3/2/7/132712207/zitoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/tobil.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/93708687128.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35535883354.pdf
    • https://cdn.shopify.com/s/files/1/0444/4500/8039/files/improper_waste_disposal_in_the_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6502/files/vupujepe.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3318/files/tifabosegobavazomodepibu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7750/0057/files/47316448791.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/gagisusitafaxofu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3131/files/66767921136.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46905239833.pdf
    • https://cdn.shopify.com/s/files/1/0434/4233/9992/files/augmented_reality_journal.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_off000065be.bin
31056ff408e85d516159d55eeedd3cc56d8ac5a75a61778ef1ecfbdf26db5cbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 4852 bytes
font_01_sfnt_off0000764a.bin
26fa003556498f3bb8e3bf3f4b9a275d79950c5b28c6e61f2aeb31a472fc8dbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764A 10144 bytes

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