Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc81f96197bc63e…

MALICIOUS

PDF

61.6 KB Created: 2020-08-03 16:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ae6981c54ef96d7211ed27534ee53ea SHA-1: 35e7a0dd776f100c254f265e73e9d2b7b76063bf SHA-256: 0dc81f96197bc63e05e82904155dbe0912e789638968f78c17b92bd2bf57aa94
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link-farming or content distribution scheme. While no scripts were directly extracted, the presence of embedded URLs and the malicious redirector strongly suggest an attempt to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

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=separation+methods+in+analytical+chemistry+pdf
    • http://files.edhgs.com/uploads/1/3/1/4/131408529/lujaremokike_nezuki_derunelizaxeti_kelabij.pdf
    • http://files.prestigehomecare.com/uploads/1/3/2/6/132682282/b3d6fee9d337715.pdf
    • http://files.hisandhersboutique.net/uploads/1/3/2/7/132740536/1950206.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/57199596813.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2928/files/kevabeduparuzegisavef.pdf
    • https://cdn.shopify.com/s/files/1/0449/6493/7896/files/mass_effect_2_kasumi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0056/8736/files/malakis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3325/files/foderubukibunax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/dukadaloriduxoxamiduk.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/5674361797.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/suriziw.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7319/files/72614227491.pdf
    • https://cdn.shopify.com/s/files/1/0434/5823/2473/files/sorezusaloxuna.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.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_off0000a3d7.bin
18441132bc87bedc91f6df1b0631d9e351d95cd91e6a5094a45c7bade9c5c6ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3D7 5388 bytes
font_01_sfnt_off0000b5f7.bin
978c6ebfa9b1d1f64326a081bc1ef4026da28825a43293b20e1c970cc2ef3d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F7 10824 bytes
font_02_sfnt_off0000dabf.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 4324 bytes

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