Malicious PDF — malware analysis report

Static analysis result for SHA-256 776a81e1289bfb82…

MALICIOUS

PDF

48.8 KB Created: 2020-08-07 15:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68182d414d34f24120bbc34eb09f6d81 SHA-1: 45edd152cb28ddf9b92090d5ae8607e0d10b19ad SHA-256: 776a81e1289bfb8244f08ca4c657dbc208d7f3787697fd6bb750a184f66d5885
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=antonio+vivaldi+spring+pdf', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, many of which are to benign-looking PDFs hosted on Shopify, likely to mask the 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.ru/pify?keyword=antonio+vivaldi+spring+pdf
    • http://files.harmonyspaces.net/uploads/1/3/1/3/131380128/pagip-jinuzugugutabo-fekinoguzabaw.pdf
    • http://files.wkuprecollegepiano.com/uploads/1/3/1/4/131454620/320e47ffbd60e2.pdf
    • http://files.courtneymillerpilates.com/uploads/1/3/2/7/132710628/d070f4c932c34f.pdf
    • http://files.wcgme.com/uploads/1/3/0/7/130739119/5484971.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9286/9281/files/fozemijonijonibereko.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/nuvekuxe.pdf
    • https://cdn.shopify.com/s/files/1/0436/5756/0217/files/78408120922.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/42251357911.pdf
    • https://cdn.shopify.com/s/files/1/0428/5733/2895/files/merowegivinomarelugef.pdf
    • http://zagiku.atlanticpewter.square.site/uploads/1/3/1/4/131437246/003562d9196ca.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0135/files/79503369749.pdf
    • https://cdn.shopify.com/s/files/1/0437/2630/7480/files/2864635586.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/nebavow.pdf
    • https://cdn.shopify.com/s/files/1/0437/5789/5831/files/magofefamo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7739/3815/files/21011063931.pdf
    • https://cdn.shopify.com/s/files/1/0428/3600/0931/files/57653055686.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5367/files/xenavif.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/dotejulos.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_off000080de.bin
7e02235ec8ba83921d33597bd4d3311eaf405986935a020bdde5c073c8d0ea03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DE 5256 bytes
font_01_sfnt_off000092d8.bin
280ea944c0d522e7c58283bc7f00b6fd519a63064a6fb9196f45b78359fec5ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D8 10228 bytes

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