Malicious PDF — malware analysis report

Static analysis result for SHA-256 00487a44169f538f…

MALICIOUS

PDF

43.5 KB Created: 2020-10-18 01:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8afe8c0c2e039cd6fa4a7699335e330 SHA-1: d71d8b9b73a588ac44dd1d144671656275adf8aa SHA-256: 00487a44169f538f6e4bcc69c2c4f4394ebf0f7d4791f1d7003b3e3bcb369980
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded external links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL found in the heuristics, suggesting it is the primary lure. The presence of numerous links to external PDFs hosted on platforms like Shopify and Weebly indicates a link farm designed to distribute malicious content.

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.link/123?keyword=ocimf+tandem+mooring+guidelines
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/817390.pdf
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/zafegebozesekot-xanuvinedepa-luzinogiwe.pdf
    • https://mepetimis.weebly.com/uploads/1/3/1/4/131483418/efa78.pdf
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/7104943.pdf
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/8032810.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/3718456.pdf
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f871253d2d98.pdf
    • https://cdn-cms.f-static.net/uploads/4366325/normal_5f87162b8c7e4.pdf
    • https://cdn-cms.f-static.net/uploads/4372080/normal_5f8a01b26851c.pdf
    • https://cdn-cms.f-static.net/uploads/4370317/normal_5f895e4c66e1e.pdf
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f891b5990e39.pdf
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/roxebixa.pdf
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/d4666c.pdf
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/6600921.pdf
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f86fcef2268f.pdf
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5f875336e486b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0479/2906/5639/files/vofulepaxebipa.pdf
    • https://cdn.shopify.com/s/files/1/0497/7659/1002/files/32342771812.pdf
    • https://cdn.shopify.com/s/files/1/0266/9346/8347/files/batex.pdf
    • https://cdn.shopify.com/s/files/1/0502/8125/0978/files/hotstar_tv_apk_download.pdf
    • https://cdn.shopify.com/s/files/1/0476/7481/8726/files/97188419351.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_off00006abf.bin
a7487bb72c2b17d0320f8f6360446ab8718923350551a74a3d42b3bcdda7a11e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABF 5368 bytes
font_01_sfnt_off00007cdb.bin
3579d0f162cc46a4c18f84b3ee0478f75ba215622fd16518dc2a02a48c7a8091		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDB 10380 bytes

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