Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a36cacceae9b603…

MALICIOUS

PDF

39.9 KB Created: 2020-07-31 17:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6acaa13928e4870cfd466e46c9c252a5 SHA-1: 49e50ddae226cc106ec4d4e4ded0cb5fbecc33c1 SHA-256: 5a36cacceae9b60348576b92dcba10628fa24dda290d3e466e5ae1c123d58a21
154 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to malicious infrastructure, disguised as a helpful article. The ML classifier strongly indicated maliciousness, and the PDF structure includes a large number of external links, suggesting a link farm or redirection attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the redirection heuristic point towards a phishing or scam 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.com/pify?keyword=how+to+hear+yourself+on+discord
    • http://files.rockridgewoods.com/uploads/1/3/1/4/131437660/kemarusulef_xulexerawazi_kotuvofiraje_wugunusofuli.pdf
    • http://files.otterhaus.com/uploads/1/3/1/4/131407102/4d7b6822d75bbc.pdf
    • http://files.essenceofbeautydublin.com/uploads/1/3/1/6/131637057/9362341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8152/2599/files/53320503905.pdf
    • https://cdn.shopify.com/s/files/1/0434/2808/5912/files/niwexexil.pdf
    • https://cdn.shopify.com/s/files/1/0435/5234/2184/files/torimubelotefu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4280/6680/files/9014395697.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8397/files/jaloregozasifesimanazep.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/34680517374.pdf
    • https://cdn.shopify.com/s/files/1/0437/0835/0615/files/5673164487.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/xarowa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/logopazunu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6117/2631/files/45623576663.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/62056687944.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0859/files/xewerukigip.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_off00005eb1.bin
543ae15648b0dbaa7f798e8bbda573e5c6e1291a18239a04f1f44085b310e5c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB1 5264 bytes
font_01_sfnt_off000070a9.bin
62fbc35eaaa9f53b114c5205b3ab766e5eaa4bc1150d32cf4cab79f768fcd79b
pdf-font-stream PDF embedded font (sfnt) at offset 0x70A9 9828 bytes