Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c37bbee1488c31…

MALICIOUS

PDF

45.0 KB Created: 2020-08-12 05:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 409fd8d4d3e8854717d831b423a1adec SHA-1: b1884e06b88cf9f8f7398c8efcb5fa014edac641 SHA-256: 13c37bbee1488c31d5476270e37fd165cda2d17c32b4f6b65cfe891573194482
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The presence of many Shopify-hosted PDF links suggests a link farm or SEO manipulation tactic, potentially to obscure the malicious redirector. No scripts were extracted, but the embedded URLs are the primary indicators of 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/pify?keyword=mariage+d+amour+pdf
    • http://files.redrunebooks.com/uploads/1/3/1/4/131411688/wukuf-kitawawizani.pdf
    • http://files.elainecairneyhomeopathy.com/uploads/1/3/1/4/131437044/dumutejesok-kumofakex-dukagew-fevumu.pdf
    • http://fugokujek.sheiladavis.ca/uploads/1/3/1/0/131070420/fonetezosujekow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/convertir_de_a_word_online_con_ocr.pdf
    • https://cdn.shopify.com/s/files/1/0436/9842/1913/files/manga_studio_5_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/9720454618.pdf
    • https://cdn.shopify.com/s/files/1/0430/3162/5882/files/xotik.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/monitoring_and_evaluation_reports.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/84776822552.pdf
    • https://cdn.shopify.com/s/files/1/0430/9427/8293/files/38590402050.pdf
    • https://cdn.shopify.com/s/files/1/0434/0930/9848/files/72591106343.pdf
    • https://cdn.shopify.com/s/files/1/0427/9150/1990/files/53699211171.pdf
    • https://cdn.shopify.com/s/files/1/0431/3631/9639/files/zenazuk.pdf
    • https://cdn.shopify.com/s/files/1/0439/8071/8238/files/autumn_leaves_trumpet_chet_baker.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d5c.bin
ecd2a3d40e5a2f3c8d9e572521189f3032b33fc8b27be3ff3b97d65feabd9393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D5C 5156 bytes
font_01_sfnt_off00005ecd.bin
1f1ca983a0d6ce976ed0d1d93873d250712b60a76ae721accbb10213f9aced0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECD 3320 bytes
font_02_sfnt_off00006c90.bin
bf5ac94d1ef0cd3363a03e85dab47612c1a80351b813a6965ad6146d8bfd1278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C90 10848 bytes
font_03_sfnt_off000091e1.bin
15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91E1 16120 bytes

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