Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c864c171d307f1…

MALICIOUS

PDF

52.4 KB Created: 2020-08-29 08:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7503fed91dd54d58c4c505f1a609f952 SHA-1: fcacc1b9935c040aa05674d24794dd3fd570f9e8 SHA-256: 89c864c171d307f1938f48ab270f5886e29883af29d3092c4728dd55c3392596
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDFs, which is indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=led+arduino+projects'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links.

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/wix?keyword=led+arduino+projects
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_a2069fcc385d483c8417b5d2b6ac7d3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_0265392217ca4d0c9113f8cf1b3a9dd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_53e8f6c744ad4c91b07e0a08e93016c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_ecf87b87e9d6415997fea48b7193cf8d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e56b2ce15c044e99ac8fe15d1b72301.pdf
    • https://cdn.shopify.com/s/files/1/0429/8086/8255/files/wuboxivazaxajikogo.pdf
    • https://cdn.shopify.com/s/files/1/0464/6843/2040/files/18120669335.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/35837871531.pdf
    • https://cdn.shopify.com/s/files/1/0434/6671/9385/files/ios_8_default_wallpapers.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a6ee4b485994e83a8f61d18f6b92ae3.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a279f7c876e4297b12e32b26304f15c.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/best_blur_background_app.pdf
    • https://cdn.shopify.com/s/files/1/0439/3995/4856/files/discovering_behavioral_neuroscience_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/kenotovijurok.pdf
    • https://cdn.shopify.com/s/files/1/0435/5050/7163/files/61503629997.pdf
    • https://cdn.shopify.com/s/files/1/0433/4659/1903/files/b_v_chauhan_books_gujarati.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ab4f.bin
078c738952e68e07b269c40b4a49e385ff7f8f150db1693b9128eed98943bab9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAB4F 17396 bytes
font_00_sfnt_off0000764d.bin
10f4a2718202014c4e4e4b7f4cc96d0fd7fd3630a17addd02d7c0d0b39c74273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764D 5052 bytes
font_01_sfnt_off0000878b.bin
cbd16d7da5f71ed637c1e7a8a4f662f06a890c8ceab246c2e3ab64e3516a3bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x878B 10376 bytes

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