Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b25374137e325ab…

MALICIOUS

PDF

39.5 KB Created: 2020-08-03 17:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5d8770346162a0801818db78bff74ee SHA-1: d02b01cc25d2f4d6a1880fb1ea1fb6717ab7875b SHA-256: 6b25374137e325ab4c57720a056533100d307622d5b7594d2fd40ee6748a61e2
162 Risk Score

Malware Insights

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

The PDF contains a lure related to a 'Nintendo dsi operations manual error' and embeds numerous links, one of which, 'https://ttraff.cc/wb?keyword=nintendo%20dsi%20operations%20manual%20error', is flagged as a malicious redirector. The document also exhibits characteristics of a link farm, with many embedded URLs pointing to PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicated maliciousness.

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.cc/wb?keyword=nintendo%20dsi%20operations%20manual%20error
    • http://files.redlakeclinic.com/uploads/1/3/0/7/130776351/230a1e27db5c0.pdf
    • http://files.treeservicejacksonmi.com/uploads/1/3/1/4/131483097/zudikem.pdf
    • http://files.heritagefireequipment.com/uploads/1/3/1/8/131856860/aee0e.pdf
    • http://files.oldvicarage.org/uploads/1/3/1/8/131871569/aea0499e4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7584/5792/files/lividatexojivovimumapokuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/4063/5042/files/android_home_environment_variable.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0436/0673/7053/files/gupizaruso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wiwatubaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2591/4262/files/ritogagetutufe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/fanimasawaxunokaludabesig.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/8805365569.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/gw2_tp_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/juwagarabisimuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.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_off00005cdf.bin
f65be70d425aa560492cff68d316d2a824f50467ada6db947d011bd4dda86e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CDF 5072 bytes
font_01_sfnt_off00006e06.bin
d2017975bc8d6428ff5c676c443934d5b96e540759b8f7505f77a6d3e84bda63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E06 10296 bytes

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