Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb47b1083c107ec…

MALICIOUS

PDF

40.4 KB Created: 2020-08-07 19:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d41e157a4b593f27bbf4cddf3ed0e7a7 SHA-1: eb1ce7d4b4fef33659109ed6bd6e7b5748a13b9d SHA-256: acb47b1083c107ec1fdaf8d7fc8498d0342062d40d95911fcff506ce1b18c6e3
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is 'https://ttraff.cc/pify?keyword=american+sign+language+alphabet+chart+pdf', which is likely used to lure users into downloading further malicious content. The document body, though heavily obfuscated, contains references to PDF files and the malicious URL, reinforcing the redirection attempt.

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.cc/pify?keyword=american+sign+language+alphabet+chart+pdf
    • http://files.castleunicorn.com/uploads/1/3/1/3/131398139/senitiwerozutozela.pdf
    • http://zaged.josephegreco.com/uploads/1/3/2/6/132681670/goxozaw-gabab-pexerewuwexudum-gefoz.pdf
    • http://files.coronafire.org/uploads/1/3/0/9/130969873/nafibizisilu.pdf
    • http://files.heatherseagraves.com/uploads/1/3/2/3/132302774/nufigidoruz-reverime-mojavo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6644/1376/files/dotazojofofupatanu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9114/9475/files/64611927414.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7762/files/xifukefepalelova.pdf
    • https://cdn.shopify.com/s/files/1/0432/5559/5172/files/42698995644.pdf
    • https://cdn.shopify.com/s/files/1/0433/5714/3199/files/55314873722.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zigomotixiwututorevibalu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6653/files/58153103119.pdf
    • https://cdn.shopify.com/s/files/1/0428/5802/1027/files/42600356146.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0437/6697/2577/files/hearthfire_extended_sse.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_off00005e18.bin
94f0233de78f29bd6757257a343fba0be7ac5116c444a00f1234283a0495e3e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E18 5700 bytes
font_01_sfnt_off00007145.bin
e824ea95225b759421265fae619898f14a0ea7c9e6c1ae5efb05d3d2be13650d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7145 10520 bytes