Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c8cb9d1eec2023…

MALICIOUS

PDF

50.6 KB Created: 2020-08-14 06:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2697259ef28f3b04b1096c063324cd6 SHA-1: fe061ba71a120050cb72449e42b3b80952695f9d SHA-256: 91c8cb9d1eec202336eaabf79cf7d91cada028ee38050f5133990d38a0b4137d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a malicious domain, likely to trick users into downloading further malware. The document body itself contains obfuscated text and URLs, including a direct link to the malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent.

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.com/wb?keyword=conversor%20de%20pdf%20a%20excel%20portable
    • http://files.ducksoupntreats808.com/uploads/1/3/1/3/131383825/5937826.pdf
    • http://files.plusvacationrental.com/uploads/1/3/2/6/132683357/xizibidifilana.pdf
    • http://zekinila.dudleysafes.com/uploads/1/3/1/3/131380005/25c8baad520.pdf
    • http://files.pierpontchurch.com/uploads/1/3/0/8/130813841/nelubuxezu-feroxawalinezob.pdf
    • http://naxirepe.allaboutfloors.com/uploads/1/3/1/4/131452976/vusim.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0629/files/gonejewukexidibozota.pdf
    • https://cdn.shopify.com/s/files/1/0439/7573/7502/files/69354753506.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/gutizagakakowido.pdf
    • https://cdn.shopify.com/s/files/1/0432/8374/2884/files/togof.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/fisowexo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1718/2104/files/52435375508.pdf
    • https://cdn.shopify.com/s/files/1/0434/2376/0536/files/kabuzinurajeguvinezukazu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2398/3015/files/9106759489.pdf
    • https://cdn.shopify.com/s/files/1/0430/6839/1591/files/ripisoseta.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/woxonatomezaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/6903/1078/files/bytecode_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0430/7314/2935/files/riwixalumuvibekikijuza.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007702.bin
641bdbeb54dfe12dda6f197bb102783a9d3309deab4cb30ac2685f0cc0fc96fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7702 5180 bytes
font_01_sfnt_off000088b0.bin
2bcacb4aec36c1fbe54425f46ed6d48b1344ffe244238416d4273aaee560c9fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88B0 11460 bytes
font_02_sfnt_off0000adca.bin
8405bb6ca9a6fb718a2e910e1cdde4d74ac2122cab0061dc5f772322db9c7ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADCA 4324 bytes

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