Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f1bf2cd81a3408…

MALICIOUS

PDF

45.2 KB Created: 2020-08-29 01:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af0f49ca60999d3aa5b7968e079ff2a4 SHA-1: 98e5fc4f588753061cbd0854124e30a9da9eb34d SHA-256: 64f1bf2cd81a340817f8bdade52a2f06ccd02a469025cb5a77ed4220c7e301d0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm of 28 external PDFs. One of these links, https://ttraff.cc/wix?keyword=test+de+canales+de+aprendizaje+para+ni%25C3%25B1os, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of embedded URLs and the link farm suggest an attempt to redirect users to malicious content, possibly for phishing or malware distribution.

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/wix?keyword=test+de+canales+de+aprendizaje+para+ni%25C3%25B1os
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0465/1663/3750/files/sharper_image_camera_drone_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3305/files/understanding_the_apostolic_anointing.pdf
    • https://cdn.shopify.com/s/files/1/0459/8978/9853/files/84543382978.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/saxirufu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/study_sheet_brain_anatomy_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/13109617697.pdf
    • https://cdn.shopify.com/s/files/1/0437/4007/0042/files/rawikejiva.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/15355922456.pdf
    • https://cdn.shopify.com/s/files/1/0464/6495/8616/files/80980851579.pdf
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/sijegoxugelakot.pdf
    • https://cdn.shopify.com/s/files/1/0427/7927/9527/files/vakazuverujured.pdf
    • https://cdn.shopify.com/s/files/1/0431/6915/3181/files/48235578044.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1125/files/wonusisatoxigefoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/35010499232.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006271.bin
98f52255edf354f38abd240eac0e9f2dd9d6d6f93a5e50e6db5f95659d4b5817		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6271 5144 bytes
font_01_sfnt_off000073b2.bin
5ef74960fdcb5cb4b35ad2d45419c4848de5e1b0162aaf4a3e54990ab9481d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 10960 bytes
font_02_sfnt_off00009728.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9728 4324 bytes

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