Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf620d3a6647b1c…

MALICIOUS

PDF

46.4 KB Created: 2020-08-10 02:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0d71228700e627a301f0d936da2c222 SHA-1: 820220dce99321ca00c4d6e9705e901c60390d01 SHA-256: 5cf620d3a6647b1c5d9ef3fc29ee8cdf5060cab20affd87a9ffcc9a4c42e438a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the link farm, suggesting a deliberate attempt to create a link farm for SEO manipulation or to distribute malicious 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=blood+type+b+negative+diet+food+list+pdf
    • http://files.vermontlearningsupport.org/uploads/1/3/0/7/130775537/tesoruzoji_gagasojosut_midewi.pdf
    • http://files.dscottcurryatty.com/uploads/1/3/1/1/131164473/8677504.pdf
    • http://files.deborahjonesyoga.com/uploads/1/3/0/7/130775171/6009060.pdf
    • http://files.capsulate.life/uploads/1/3/1/4/131482832/sepajetekava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/0407/3880/files/95104322325.pdf
    • https://cdn.shopify.com/s/files/1/0434/5049/9222/files/18139907281.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19189676900.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/58275889473.pdf
    • https://cdn.shopify.com/s/files/1/0433/5383/3637/files/27674927949.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/bolizupofov.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8298/files/funiledakum.pdf
    • https://cdn.shopify.com/s/files/1/0437/0546/7035/files/43267410676.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/57238259297.pdf
    • https://cdn.shopify.com/s/files/1/0435/6050/1407/files/muvawozivofufolit.pdf
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/arma_3_maps.pdf
    • https://cdn.shopify.com/s/files/1/0434/7209/3336/files/89052383906.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/46496789010.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/5504966499.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_off00006aee.bin
450ee1c9c3480b1f1f8f0a5d81ec852739e30b096947d1a05cb1d792dfb0c68d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEE 5252 bytes
font_01_sfnt_off00007cf0.bin
78a975df1bca2ff159a89ce9af47f6f36c4ca8f13aab560202b254b413905c5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF0 9768 bytes
font_02_sfnt_off00009e64.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E64 4324 bytes

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