Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3966355be85e42…

MALICIOUS

PDF

43.3 KB Created: 2020-07-18 21:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70276d77bdf74760becc92eafc5e3dc9 SHA-1: 2dbd0bdda9aece02c15c5d46996c80ade7dc21ab SHA-256: 1c3966355be85e424926e9d144a0aa9a9f2d63297e6128ba2496207c3fb803d3
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external websites. One of these links, 'https://ttraff.ru/wb?keyword=ocr%20gcse%20maths%20past%20papers%20pdf', is flagged as a malicious redirector. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. No scripts were extracted from this sample.

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.ru/wb?keyword=ocr%20gcse%20maths%20past%20papers%20pdf
    • http://files.deasafirahilda.com/uploads/1/3/0/8/130873945/divegufonexuzav-guvod-topap-vaximoki.pdf
    • http://files.denaults.com/uploads/1/3/0/7/130738969/masomenujixala_zuzizapuxasoda.pdf
    • http://files.edgingtonroaddistrict.org/uploads/1/3/1/1/131163932/difomaza_dubovunen_xalexujoxefop.pdf
    • http://files.edgingtonroaddistrict.org/uploads/1/3/1/
    • https://serifutaje.files.wordpress.com/2020/07/jezadumavukogejaviviw.pdf
    • https://gatidokojoku.files.wordpress.com/2020/07/sojetawabapanovarimif.pdf
    • https://kizudefogelo.files.wordpress.com/2020/07/suzufazapava.pdf
    • https://xovexin.files.wordpress.com/2020/06/fobilakedefuteluzaduxijak.pdf
    • https://bavorekivaso.files.wordpress.com/2020/06/kuwazud.pdf
    • https://vaduwokasi.files.wordpress.com/2020/07/jekosemipujeti.pdf
    • https://bunavetesew.files.wordpress.com/2020/07/61012648756.pdf
    • https://doraxurewaz.files.wordpress.com/2020/06/wanozovufemim.pdf
    • https://sefilako.files.wordpress.com/2020/06/bemajalegedof.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinavupomun.pdf
    • https://cdn.shopify.com/s/files/1/0434/3804/7384/files/45068557007.pdf
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/pefiwowidu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/32914748004.pdf
    • https://cdn.shopify.com/s/files/1/0431/3848/2332/files/74717036516.pdf
    • https://cdn.shopify.com/s/files/1/0428/0533/0083/files/1647739621.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1782/files/bopuki.pdf
    • https://cdn.shopify.com/s/files/1/0431/5942/1092/files/xoxuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/pinofekefomefevagonulok.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_off00006781.bin
a89f9cf545cbe1351be270fd91ba33a00f5f80071fafd00d70f31b77c207f575
pdf-font-stream PDF embedded font (sfnt) at offset 0x6781 5088 bytes
font_01_sfnt_off000078cb.bin
0b7a34bd93f35f3b990f606217e21a300be225366d3b479c1d5a312fec599257
pdf-font-stream PDF embedded font (sfnt) at offset 0x78CB 12416 bytes