Malicious PDF — malware analysis report

Static analysis result for SHA-256 6785a781ed83125c…

MALICIOUS

PDF

46.6 KB Created: 2020-07-30 13:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cf5ab610c5e1651d77fea1763f24b78 SHA-1: e813795497dcbb2f699caf41bb37ff53877f0a38 SHA-256: 6785a781ed83125c94c0165ff6ba496355f5eae1437a9ebd71bcb9aa2405e4af
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious redirector suggests an attempt to lure users to a compromised site for further exploitation or phishing. The document body appears to be malformed or heavily obfuscated, preventing a clear understanding of its content.

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=berliner+platz+1+pdf
    • http://files.kingcountyexplorers.com/uploads/1/3/1/6/131636914/gerejilamasowibokan.pdf
    • http://files.theuilanifund.org/uploads/1/3/1/3/131380128/gadigekamupole-dijodip.pdf
    • http://files.delvera.org/uploads/1/3/0/7/130775049/funijutaxasi.pdf
    • http://files.beebrighthives.com/uploads/1/3/1/1/131163561/bdf6e4d.pdf
    • http://files.heavensentchihuahua.com/uploads/1/3/1/4/131413678/9801299.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7757/3539/files/sarunosi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/26043711027.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/80892345761.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/tevukipabaxuvuto.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3452/files/dilutoboro.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/89197965582.pdf
    • https://cdn.shopify.com/s/files/1/0440/5189/0341/files/fijaraw.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/8735843015.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/sefomukup.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/rinatunokevajulexalowit.pdf
    • https://cdn.shopify.com/s/files/1/0430/7193/0529/files/gogoju.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077c3.bin
98e49836859b9edf4a417e9f5c790a3b09c44f84ddb3ec605bf058ccb8f00a53
pdf-font-stream PDF embedded font (sfnt) at offset 0x77C3 4684 bytes
font_01_sfnt_off000087b8.bin
34707305d99a01c6d769d3429724846f7f1aeae4f3e222d93611fd411bc01ad6
pdf-font-stream PDF embedded font (sfnt) at offset 0x87B8 11040 bytes