Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d93382cc09325d…

MALICIOUS

PDF

44.3 KB Created: 2020-08-12 02:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b998c60fd43b8ea55ad1e7d6b7a10c38 SHA-1: 3bb05a1caaf34e6da8862cbfdcb3db1c5b19b5ba SHA-256: 83d93382cc09325d905e1e7541926bae1d583ee1357e08704675ac9a8aa4ffd1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=narrative%20elements%20worksheet%20pdf'. Another heuristic indicates a large number of external PDF links, suggesting a link farm designed to attract traffic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards 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.ru/wb?keyword=narrative%20elements%20worksheet%20pdf
    • http://mesipob.theguitarengineer.co.uk/uploads/1/3/1/3/131398351/mevafimotumoripa.pdf
    • http://files.borneogynae.com/uploads/1/3/1/8/131856279/2116490.pdf
    • http://files.moraystore.com/uploads/1/3/0/7/130739616/5950678.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/2195/9325/files/54527534328.pdf
    • https://cdn.shopify.com/s/files/1/0430/7347/0618/files/waxafug.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/25244342720.pdf
    • https://cdn.shopify.com/s/files/1/0428/5317/1356/files/defepoberotoluvonij.pdf
    • https://cdn.shopify.com/s/files/1/0429/4252/9695/files/virenipigowifuwenilan.pdf
    • https://cdn.shopify.com/s/files/1/0435/8933/7256/files/algebra_worksheets_grade_7_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7082322425.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/2162551378.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7668/files/99741786636.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9957/files/populate_form_from_database.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/gokudesipujanurepariwowu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fimovubonivunab.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_off000061de.bin
2eb122ef56f13b0035afe238dc8964627db078471a89179d09afbcd45dab0123		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DE 5256 bytes
font_01_sfnt_off000073a2.bin
9944c9b66cdce75a3de2cbabfee10a080e85935230f21ba39fccbdd94239b9d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A2 10164 bytes
font_02_sfnt_off00009655.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9655 4324 bytes

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