Malicious PDF — malware analysis report

Static analysis result for SHA-256 6914fe30ec43a46d…

MALICIOUS

PDF

51.2 KB Created: 2020-08-12 13:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c30f5c190aabae8eb1593c243c34d95 SHA-1: f79c0260d288f272e93007d3ec2930f140cd32db SHA-256: 6914fe30ec43a46da98f8a996fb387c5750c9b9f2181a043cba7367a398b9c60
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains text suggesting a lure related to 'Bus 166 nj transit pdf'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=bus+166+nj+transit+pdf
    • http://files.margarethagubernale.org/uploads/1/3/1/4/131411197/kijazujirowi.pdf
    • http://files.severnwildlifecarvers.net/uploads/1/3/1/8/131856317/99ff9ed0ea4d06.pdf
    • http://files.takeabowkilmarnock.com/uploads/1/3/1/4/131406739/5395845.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/barnett_lewis_1994_outliers_in_statistical_data.pdf
    • https://cdn.shopify.com/s/files/1/0432/8819/9328/files/litenigagorovifazivu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9842/2934/files/a_thousand_years_guitar_chords.pdf
    • https://cdn.shopify.com/s/files/1/0429/7293/8399/files/is_there_a_purpose_to_life.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9813/files/vebonakutupokel.pdf
    • https://cdn.shopify.com/s/files/1/0434/6006/7480/files/devunigomabeledivoxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2879/0946/files/zukivira.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/anexo_22_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/70164170471.pdf
    • https://cdn.shopify.com/s/files/1/0430/4440/5397/files/altitude_of_a_triangle_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/wuwoboxof.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/jojusifolujirekenidom.pdf
    • https://cdn.shopify.com/s/files/1/0434/2366/2236/files/biodata_for_marriage_free_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008199.bin
39aea4b9e5ee6c8f95a87a6bc7e0fc524e5b6608e8698a9bfb24ba0863370a09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8199 5332 bytes
font_01_sfnt_off000093d1.bin
bd14da8e06f42690a6972e6680e0bfd5a2ee932651faf0a7fbec5a8bc0f009ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93D1 13272 bytes

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