Malicious PDF — malware analysis report

Static analysis result for SHA-256 848b71169b885d4a…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 05:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2a5faa53f3d534cc3fbd16672aefd27 SHA-1: 4d518033f3728ec92d38c7a5351eefe64e975114 SHA-256: 848b71169b885d4ad012311dc36e828e370619727a1187eded7e699dbb8e1754
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. This redirector is likely used to obscure the final malicious destination. The presence of a 'download button' heuristic and the ML classifier's high confidence further support a malicious intent, likely to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=stock+market+analysis+r.+g.+krishnan+pdf
    • http://fosexipiv.christianemillinery.com/uploads/1/3/1/6/131636755/6168702.pdf
    • http://files.cpgtrips.com/uploads/1/3/1/6/131637273/18c3c17ae2ad.pdf
    • http://xosof.atlanticsafe.com/uploads/1/3/1/4/131453555/gozosipejapasi.pdf
    • http://xafapora.evangelizeme.com/uploads/1/3/1/4/131409200/4774678.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3623/8236/files/63497285761.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/39054959798.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/logubamokalerafofilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/jajinujojekiduwaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/2270/5063/files/69533935796.pdf
    • https://cdn.shopify.com/s/files/1/0435/5119/5299/files/nupujeseg.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/vejopafovarovowumami.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/budubopama.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3656/files/32149192306.pdf
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/24678004675.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/sirizifanirinadiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/2409248578.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_off000064be.bin
ea8cda0e8f13f15b14ae32614f2a72b972f4647e8d5f23835b759169a805e2e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64BE 5872 bytes
font_01_sfnt_off0000788a.bin
ec7da993e44f3efeb433f8e698800bf8684a16b85fdde44816bb7fdef9510a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788A 10584 bytes

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