Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bd3644e1646141…

MALICIOUS

PDF

43.9 KB Created: 2020-07-31 21:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62c834ff3807b5bde8ee05756e6bd3e1 SHA-1: cf36fb66b9771c91aa00035f2350f3764391c947 SHA-256: 67bd3644e1646141a8479ca3e935a9ba993399925af7c4f7f1286583280f0c76
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL, suggesting an attempt to direct users to potentially harmful content. The ML classifier also strongly indicated maliciousness.

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=how+to+enable+freesync
    • http://files.retroquesting.com/uploads/1/3/2/6/132681951/fosalevef.pdf
    • http://files.greenwoodtoylibrary.org.au/uploads/1/3/1/3/131383771/ririsufal.pdf
    • http://files.alextissiere.com/uploads/1/3/0/7/130776599/7127169.pdf
    • http://files.laurenceremacle.com/uploads/1/3/1/3/131383791/06b8bbf2d.pdf
    • http://files.pronkzaak.nl/uploads/1/3/0/7/130738974/zided.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/9884335300.pdf
    • https://cdn.shopify.com/s/files/1/0438/9886/3771/files/2_digit_addition_and_subtraction_with_regrouping_worksheets_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/6714/6397/files/sukuweboxe.pdf
    • https://cdn.shopify.com/s/files/1/0436/0696/6429/files/59442577018.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0924/files/jodoridi.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/lisenaxijug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/palafasejuzanuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdf
    • https://cdn.shopify.com/s/files/1/0429/2476/9436/files/16263400841.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/viwef.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/49106652300.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/sunni_islamic_books_in_urdu_free_download_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/konudivabepag.pdf
    • https://cdn.shopify.com/s/files/1/0435/7727/8627/files/1991604624.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_off00006bf2.bin
916475f46b624038774a9c954ec98a004c4995ad08f051f550d6b54a488ef000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF2 5168 bytes
font_01_sfnt_off00007db3.bin
085b89d9d8596901c7562dfb5aec0776cfe52ee6c464b9a100c7c5377853ce0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB3 10876 bytes

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