Malicious PDF — malware analysis report

Static analysis result for SHA-256 805c8e33e3b692cf…

MALICIOUS

PDF

57.7 KB Created: 2020-07-21 18:39:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b19ed405fe9dc975a8fc5a63d2e95220 SHA-1: 9c7973cddbf8242ca788adcabda160462a72ae54 SHA-256: 805c8e33e3b692cf6a1bcbe6d0fe8a00ae0104a7334afbff42b18fb8b50e4f83
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests it is presented as a search result for a book, aligning with SEO spam tactics. The presence of a malicious redirector indicates an attempt to lead the user to a harmful destination.

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.ru/wb?keyword=raisin%20in%20the%20sun%20pdf%20book
    • http://files.montagmorgen-workshop.com/uploads/1/3/1/8/131872032/6748259.pdf
    • http://files.faisslibrary.com/uploads/1/3/2/3/132302970/nagevinemenogozon.pdf
    • http://files.c2cnys.org/uploads/1/3/0/9/130969503/a066a.pdf
    • http://files.gammaetaomegaaka.org/uploads/1/3/1/6/131636990/5608641.pdf
    • https://cdn.shopify.com/s/files/1/0431/6954/6395/files/10752743061.pdf
    • https://cdn.shopify.com/s/files/1/0428/2744/8476/files/vexatuzajegepinudelel.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/pivuguporutisozajowetakub.pdf
    • https://vakaximez.files.wordpress.com/2020/06/8756863634.pdf
    • https://ratumiratox.files.wordpress.com/2020/07/75308720961.pdf
    • https://jovemubam.files.wordpress.com/2020/07/sebomawodamafuguwum.pdf
    • https://tasebetov.files.wordpress.com/2020/07/fipabolipo.pdf
    • https://pizitotilu.files.wordpress.com/2020/07/tumifub.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/bawepudobunekibemanavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/worafuwiwokazililisetin.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/leraredasoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1236/files/96525853611.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/xewin.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/63630531190.pdf
    • https://cdn.shopify.com/s/files/1/0430/1013/0073/files/dulokanizobakubesipizobu.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_off0000a47f.bin
27aaa6af9f4da2b576111533e50e96ef9a6fb72f5dfb1b62fc00bea5a5c272e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xA47F 5092 bytes
font_01_sfnt_off0000b5c1.bin
c669035b566fc7ab3c96875f5e49b504212cfa9101f667f8786eca0e81f1fb36
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C1 10304 bytes