Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d793ae0d89d0332…

MALICIOUS

PDF

55.0 KB Created: 2020-08-06 21:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2603c5497176745ab0b008cde81b67e5 SHA-1: 97e0ae6ed629a00002828c8c590314291fddbe6d SHA-256: 6d793ae0d89d03323ecf8a07e4829af1a591050607212ee1dfa22917e3f266cd
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links, however, redirects to a known malicious infrastructure at 'ttraff.ru'. The document body itself is heavily obfuscated but contains the same malicious URL, suggesting an attempt to lure users to a malicious site under the guise of providing PDF documents. The ML classifier also strongly indicated maliciousness.

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=english+phrases+with+meaning+in+marathi+pdf
    • http://files.wholereflections.com/uploads/1/3/0/7/130740127/refisabefidadil.pdf
    • http://files.noiinsw.com/uploads/1/3/2/6/132695505/9abdf98.pdf
    • http://wasifu.chrisschnabelart.com/uploads/1/3/1/6/131607131/noposugajoxudoz_safasur_winakenetow_fuxok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0434/7291/2549/files/86912361297.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/mt_hood_meadows_snow_report.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/20989373238.pdf
    • https://cdn.shopify.com/s/files/1/0435/7967/0689/files/sifobalatanajixed.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/81587660738.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/vifekekutipivibij.pdf
    • https://cdn.shopify.com/s/files/1/0429/0802/4985/files/87493789332.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/wedding_anniversary_wishes_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/61872709458.pdf
    • https://cdn.shopify.com/s/files/1/0435/3759/6575/files/79243878418.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/9058469073.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_off00006d66.bin
a56eee02f05a3f42062b31bee5eda8422af8dfbad59a49dd6da639ca08df2617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D66 5504 bytes
font_01_sfnt_off0000800a.bin
755f4a4bcb2bc5ff8d99961e708bda199b7e10594dd5842acd10171a1fb6c602		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800A 13656 bytes
font_02_sfnt_off0000ab97.bin
2473a0bcaa202bc531c35b9e8da6392d8e25d055274fe8661a391e2a98183aea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB97 10836 bytes

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