Malicious PDF — malware analysis report

Static analysis result for SHA-256 88014d636bb69734…

MALICIOUS

PDF

39.5 KB Created: 2020-08-12 18:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e3a63177ba166cf9d686a780523982d SHA-1: 12813b596d9db5bf83be7dbbd44e55f61a174606 SHA-256: 88014d636bb6973447c0513c59367be833ff67afcaeca60323e53a3d109cad82
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host other PDFs. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, also contains the same malicious URL, suggesting an attempt to trick users into downloading further malicious content or visiting compromised sites. No scripts were extracted, but the presence of malicious redirectors and link farms strongly suggests a phishing or malware distribution 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/wb?keyword=supervised%20vs%20unsupervised%20learning%20pdf
    • http://files.hubtheatreboston.org/uploads/1/3/2/7/132740586/c4b8237536c.pdf
    • http://files.shantellsnaturalhair.com/uploads/1/3/0/9/130969855/47491d4ff.pdf
    • http://files.arborcovetherapy.com/uploads/1/3/0/8/130873941/cbc05.pdf
    • http://muzimot.dentalelle.com/uploads/1/3/0/8/130814328/85c68336b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2450/6266/files/jokekelewefoparudutuxorim.pdf
    • https://cdn.shopify.com/s/files/1/0429/2070/6204/files/kanakadhara_stotram_sanskrit.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/44191716165.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/35448802457.pdf
    • https://cdn.shopify.com/s/files/1/0428/2351/6323/files/kixukexonob.pdf
    • https://cdn.shopify.com/s/files/1/0437/1231/5545/files/anandpur_sahib_resolution.pdf
    • https://cdn.shopify.com/s/files/1/0435/9526/8264/files/dosinebasijunabubuzifigas.pdf
    • https://cdn.shopify.com/s/files/1/0448/3910/8770/files/office_clerk_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0433/5127/7726/files/fepasuxepapolez.pdf
    • https://cdn.shopify.com/s/files/1/0437/7031/4903/files/lincoln_sa200_parts.pdf
    • https://cdn.shopify.com/s/files/1/0431/0607/4780/files/18259699231.pdf
    • https://cdn.shopify.com/s/files/1/0432/6175/5560/files/riesgo_laboral_definicion.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_off00005bcd.bin
45ef4a1d5b7eed74df554ec458093bdc5586dc10c0bf675b754c9880a54158ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCD 5372 bytes
font_01_sfnt_off00006e21.bin
4c8514cd71ef28126db76311248fde901ea1d4ec2159068fe61fb64167017ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E21 10180 bytes

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