Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdfae4679948067…

MALICIOUS

PDF

68.6 KB Created: 2020-08-10 05:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7c78e1086614763ddf67e67910c5f80 SHA-1: e75da64fb8360ca7260c3dd019799752fb0bb239 SHA-256: 3cdfae4679948067d3d57e866810cf925f36d5bbf2003de25ab7affa38023228
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=vsepr+theory+pdf+file', indicating a lure to a malicious site disguised as a PDF file. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=vsepr+theory+pdf+file
    • http://files.unscriptedfest.com/uploads/1/3/1/8/131856071/7470356.pdf
    • http://files.tri-villagetrails.org/uploads/1/3/0/7/130775897/varonamugagavij.pdf
    • http://vudiniw.jayowens.me/uploads/1/3/0/7/130738531/1797600.pdf
    • http://files.mudlakefarm.com/uploads/1/3/1/6/131636825/667748.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/zoxumazot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0441/1247/8360/files/62986630251.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/vajosozutuwagaziw.pdf
    • https://cdn.shopify.com/s/files/1/0439/1187/2667/files/doburogisujupizena.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/wododidak.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/fulaposedorez.pdf
    • https://cdn.shopify.com/s/files/1/0430/3300/2145/files/limufobewoferudoraromijo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2827/4585/files/83633740169.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/31461779101.pdf
    • https://cdn.shopify.com/s/files/1/0431/7442/8827/files/ronuzefivutof.pdf
    • https://cdn.shopify.com/s/files/1/0448/0407/9777/files/sprawlopolis_rules.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0875/files/86681836213.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0ea.bin
d4c9dedb71388090049353e2b83a344d88bca06f01339c37e676330558072fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EA 4960 bytes
font_01_sfnt_off0000c1dc.bin
ba647affffd55afe5cdad2c34d6cc88baba68634f2c6fc8a7f7f6aef4e0633c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 4668 bytes
font_02_sfnt_off0000d1df.bin
6df77e9f0a7ddc998d581b36eb318191ccc7b0130e4a7a0f5deec916612efefb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DF 10764 bytes
font_03_sfnt_off0000f6bc.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 4324 bytes

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