Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8be081b5f80437…

MALICIOUS

PDF

47.0 KB Created: 2020-08-19 07:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bbe686376b1a82282a3852e9422b987 SHA-1: ddde3f9b65458eea3c0d27aa1cf93e8a7e9a52ea SHA-256: 6a8be081b5f80437976a7c638e61a2276229eb092175f840e009c6b6726a2d77
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to lead the user to malicious content. The ML classifier strongly flagged this PDF as malicious. The presence of numerous embedded links, including a suspicious one pointing to `ttraff.ru`, suggests a phishing or redirection scheme designed to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=vpn+android+iran
    • http://files.rhosarts.com/uploads/1/3/0/9/130969356/mujoxozed.pdf
    • http://lisotuxir.topherkearby.com/uploads/1/3/0/7/130776611/padomafexivuxi.pdf
    • http://bokuk.s1gkusa.com/uploads/1/3/2/6/132682717/43ba82e6cc47d9a.pdf
    • http://files.templebhajanband.com/uploads/1/3/0/7/130740444/9197173.pdf
    • http://xubel.austinamericorpsalums.org/uploads/1/3/1/1/131163960/jifuwekolevajo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/3569/5016/files/jzyk_angielski_sownictwo_tematyczny_zbir_wicze.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/38434486693.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/bmw_e39_540i.pdf
    • https://cdn.shopify.com/s/files/1/0431/0709/0589/files/98309122352.pdf
    • https://cdn.shopify.com/s/files/1/0431/6227/1898/files/mugemesogiwonalisuzuguvuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/6009/1287/files/watafatojinowasadanajo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7231/3751/files/fuvebojaganovigogaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/3390/2760/files/42658658636.pdf
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/sinusitis_antibiotics_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/4518/2888/files/gavewedupuferasad.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/71269834521.pdf
    • https://cdn.shopify.com/s/files/1/0433/8047/4014/files/netorowefijof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006db8.bin
d8f494a2164150e7691d4ec4c148e6059a23e2134df666698e950efac3ee9d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB8 4300 bytes
font_01_sfnt_off00007c3b.bin
83f6e1d16ef97f36d76628ef579c9cbb82b5155264576c792328a3092ed21f66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3B 10844 bytes
font_02_sfnt_off0000a14c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA14C 4324 bytes

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