Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f5512093754cb5…

MALICIOUS

PDF

34.2 KB Created: 2020-09-14 13:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4320a94d10eff93545ff1d72de264b3 SHA-1: 2f9536adc8fa1f4106c3383fa5d5398f030d08ac SHA-256: c2f5512093754cb5e66992d0dce2422a14e4c307870eecb82a1d72c9ad5d95a1
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.link, which is disguised as a chemistry worksheet. This indicates a phishing or social engineering attempt to direct the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains the malicious URL.

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.link/wix?keyword=mixed+mole+problems+chemistry+worksheet
    • http://files.goldtimeradio.net/uploads/1/3/1/0/131069934/xinevezim_meranofukilolad.pdf
    • http://files.theonealexyoung.com/uploads/1/3/1/4/131406498/laketir.pdf
    • http://zokur.lyonsvolunteers.org/uploads/1/3/0/8/130813747/5481724.pdf
    • http://files.paperchasewholesale.com/uploads/1/3/1/4/131407918/9ce7143c82da205.pdf
    • http://tarovados.cherylbourget.com/uploads/1/3/0/7/130738943/435325.pdf
    • https://static.usrfiles.com/ugd/966478_c1f5df1e51f1499fa6016d5af106cbb8.pdf
    • https://static.usrfiles.com/ugd/2994dd_3f3ab8d2dd524bd1add9250decefd4bf.pdf
    • https://static.usrfiles.com/ugd/599026_facdf9367b35451c8ad3ead04ffc8d73.pdf
    • https://static.usrfiles.com/ugd/964009_de1b585e5f69417ba2828b61c689d8db.pdf
    • https://cdn.shopify.com/s/files/1/0437/6936/4631/files/gypsum_board_ceiling_details_dwg_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/46345000365.pdf
    • https://static.usrfiles.com/ugd/440e29_e07bd88dcb504e5ca958cc160f8a1735.pdf
    • https://static.usrfiles.com/ugd/e49726_959d9902aa014e088f75495990c3c777.pdf
    • https://static.usrfiles.com/ugd/b8c837_4eaf8e5298f744ff9c4905eb23437292.pdf
    • https://static.usrfiles.com/ugd/eed56f_ff23781491c24ea7b79b51d7d797d9be.pdf
    • https://static.usrfiles.com/ugd/4bb103_e11968ac1e5b44029a0ab4ea6b79d7ed.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_off00004744.bin
92d97f8418dfc1ae290586fd35f23c32ddac55eb8942e8a7e34508c370368ac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4744 5572 bytes
font_01_sfnt_off00005a2f.bin
1c604131dc7c85a98ce6062872bdd4da3e32e9954a9a6f479603ad972a27fc1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2F 9924 bytes

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