Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdfe3cf0cd4ea0f…

MALICIOUS

PDF

46.1 KB Created: 2020-07-20 01:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d1e85d67a184f2d61ec172f44ad6b83 SHA-1: bf15cd3e00ad4ee1eed028f9abc85aeddfbb88ac SHA-256: 3cdfe3cf0cd4ea0f8eb35fa0f92a2d0e38b65a6740155a3ae815fdc4a4e1ff91
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to 'Andhra university mba syllabus pdf 2018'. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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=andhra%20university%20mba%20syllabus%20pdf%202018
    • http://files.ajeplanners.com/uploads/1/3/2/6/132681144/fenidiz-neliwilaxi-waxifunibi.pdf
    • http://files.srpdesignstudio.com/uploads/1/3/0/8/130814868/fuzenidenazu.pdf
    • http://files.acaciaaccessories.com/uploads/1/3/1/1/131163932/1833531.pdf
    • https://cdn.shopify.com/s/files/1/0433/2175/3758/files/xixesukagixawufitet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/matam.pdf
    • https://cdn.shopify.com/s/files/1/0432/7365/0334/files/10452662475.pdf
    • https://fotenup.files.wordpress.com/2020/06/fiwofodojebavadu.pdf
    • https://rodavaje.files.wordpress.com/2020/06/xodili.pdf
    • https://xaroxodigabi.files.wordpress.com/2020/06/bisired.pdf
    • https://gozuwej.files.wordpress.com/2020/06/82263437944.pdf
    • https://ritibifido.files.wordpress.com/2020/07/mavekevonolapifopove.pdf
    • https://cdn.shopify.com/s/files/1/0432/1630/6344/files/39729284052.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/takibiwofenuvobiwi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2613/7756/files/65622398654.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/17617224239.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/14819801912.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/wapajalizijamofolov.pdf
    • https://cdn.shopify.com/s/files/1/0434/7697/5768/files/10296725611.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/
    • https://rodavaje.files.wordpress.com/2020/06/xodili

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e3b.bin
22590c7c08f1807921b6210d478d506c9a15349bd400735f31a45c6ac4802787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3B 5864 bytes
font_01_sfnt_off00008202.bin
421f28a67c2556a95d704c73a3410bd3c71fcfba3eff57824497e8cbf0001419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8202 12804 bytes

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