Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e73d247bfda7e19…

MALICIOUS

PDF

47.0 KB Created: 2020-08-08 23:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ec4223e7c8fa1439c4e15dc153c0388 SHA-1: 8806e64c9be2d22dd8ad06a648ab266176533efe SHA-256: 6e73d247bfda7e19de8f1bb5627b5ce494dd4eb0f453d66d1ce74e9fed241530
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 mimic book downloads. One prominent link, 'https://ttraff.ru/pify?keyword=statistical+analysis+with+r+book+pdf', redirects to known malicious infrastructure, indicating a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=statistical+analysis+with+r+book+pdf
    • http://files.jeanducasse.com/uploads/1/3/0/7/130739398/rurepusig-kegimatijemupal.pdf
    • http://files.mylifesaparody.com/uploads/1/3/1/4/131453402/3779088.pdf
    • http://kalinow.hollandelementary.net/uploads/1/3/1/4/131482975/2346985.pdf
    • http://files.texascenterforregionalstudies.net/uploads/1/3/1/8/131856381/29afc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/6155/7913/files/xivusetaxujiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/kupinobixowukolusog.pdf
    • https://cdn.shopify.com/s/files/1/0438/8772/2648/files/call_log_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puliwaxaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zevuwuvufotolotatagonisex.pdf
    • https://cdn.shopify.com/s/files/1/0440/6660/3158/files/bezoxexoxibolubigenajume.pdf
    • https://cdn.shopify.com/s/files/1/0437/9072/9376/files/wyrd_sisters.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/cali_move_workouts.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/71029079994.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56325204281.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_off000069ec.bin
412d05baf554f9be109298e7696a8c3269c37f5cd961079428057e36a4da3d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69EC 5416 bytes
font_01_sfnt_off00007c41.bin
8b129f35a367b7eacaa362502301e4321b92bd3ff7bf118bbb25f2bb4779b669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C41 10672 bytes
font_02_sfnt_off0000a0c4.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0C4 4324 bytes

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