Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ffcf81d8443c4f7…

MALICIOUS

PDF

43.1 KB Created: 2020-08-12 10:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1cd204b58cd2f32d5038001c1291b03 SHA-1: 1aeeb1ee1ab614cefeaaff943b950c9d04d1509e SHA-256: 6ffcf81d8443c4f74d778697a5c77684115a1e7c48519bb3ee1637163f326aad
162 Risk Score

Malware Insights

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

The PDF contains language suggesting it is an invoice or payment request, combined with numerous external links. One of these links, 'https://ttraff.com/pify?keyword=account+receivable+cycle+pdf', is identified as a malicious redirector. The document's structure and the presence of many links suggest an attempt to lead the user to malicious infrastructure, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=account+receivable+cycle+pdf
    • http://rigosika.laurenlrogers.com/uploads/1/3/2/6/132696212/sebero_wupikituvo.pdf
    • http://files.franciscanfoundation.org/uploads/1/3/1/4/131438509/841a2d01ef1c.pdf
    • http://files.daisysaywhat.com/uploads/1/3/1/8/131872286/054f929986e3.pdf
    • http://files.theartsparkle.com/uploads/1/3/2/7/132740339/vuxamunolal.pdf
    • http://files.acorridor.com.au/uploads/1/3/0/7/130775747/suwukaletajov-futuxivunu-kudumeduliwi-fusim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/dekivuwixetolamosowobu.pdf
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/action_research_project.pdf
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/66482191309.pdf
    • https://cdn.shopify.com/s/files/1/0439/7400/0798/files/anthropometrics_data.pdf
    • https://cdn.shopify.com/s/files/1/0437/9141/7495/files/sonic_rush_adventure_rom.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/pearson_physical_science_concepts_in_action.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/wozujapotubikitenujuso.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/545838458.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/jajajewe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/tuzoro.pdf
    • https://cdn.shopify.com/s/files/1/0435/5306/3063/files/tapowufababapazotomele.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_off00006ac1.bin
5f1770d9966ae206e2f43bf564c5de5b05e2c047735d6b52ef4da57452555bd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC1 5264 bytes
font_01_sfnt_off00007cb7.bin
6a59863d74e46b0716c9cfb149d120b02f5f053c98fc8645445c43aab13bed52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB7 10236 bytes

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