Malicious PDF — malware analysis report

Static analysis result for SHA-256 56128cf3a2cdac39…

MALICIOUS

PDF

39.5 KB Created: 2020-07-09 01:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc494a8f21b7e6caf14eeb5e5e40e205 SHA-1: 3ebdd5c5d7d914d9abb9519d56468ad75f4ac721 SHA-256: 56128cf3a2cdac390652d855162fb9343360ec2ab2935149aecf837272e9742f
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, including a primary redirector link to 'https://ttraff.cc/wb?keyword=past%20simple%20irregular%20verbs%20printable%20worksheets'. The document body, though heavily obfuscated, also contains this URL and other links to what appears to be a link farm designed to distribute malicious PDFs. 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.cc/wb?keyword=past%20simple%20irregular%20verbs%20printable%20worksheets
    • http://files.modernruthboutique.com/uploads/1/3/1/3/131384552/tevozafadibape-keviwukugifunup-zudewe-fogagobezikowob.pdf
    • http://files.bahaisofluton.org/uploads/1/3/1/6/131606533/9430055.pdf
    • http://files.spamitzvah.com/uploads/1/3/1/3/131384789/2268709.pdf
    • http://files.lssmgoi.com/uploads/1/3/1/0/131070521/saludow_gijajixotigase_bexevodifuwafu_biwugo.pdf
    • http://files.tallitministries.com/uploads/1/3/1/4/131409127/419881.pdf
    • http://files.tryingtofly.net/uploads/1/3/1/4/131438499/litapataxutor-wizarif.pdf
    • http://files.omrocommunity.org/uploads/1/3/0/9/130969984/9320874.pdf
    • http://files.asliagirbas.com/uploads/1/3/0/7/130776841/07f27bfa0f9527.pdf
    • https://dawedigukas920094907.files.wordpress.com/2020/06/tixapaxososufabadix.pdf
    • https://fufedep.files.wordpress.com/2020/07/wujuxotuwazemaserofitira.pdf
    • https://xifovow.files.wordpress.com/2020/07/terubawipinitizufum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1741554469.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.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_off00005e2b.bin
8af63a11a0dfd50633dd4d3f3ecc5fc5ce19c0e546c81aa9baa5d1e219e69a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2B 5472 bytes
font_01_sfnt_off000070a3.bin
2de43121487496dd6ca39d4179348bf80efca62d8b8596157410e5a8d5250d39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70A3 9516 bytes

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