Malicious PDF — malware analysis report

Static analysis result for SHA-256 782181291bd228de…

MALICIOUS

PDF

43.8 KB Created: 2020-08-08 21:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eaea8da6f9c2f2411724896c730a34e SHA-1: bc70dc4fd99907debf2c39826fe9daf8a034257c SHA-256: 782181291bd228deb66a24b64aa918068cc27fe55da5efba1c83c99b19ce92d4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=anamnesis+example+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, suggesting an attempt to lure users to malicious infrastructure.

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=anamnesis+example+pdf
    • http://nelug.danawaldonphotography.com/uploads/1/3/2/7/132740836/1ee5eef.pdf
    • http://files.classicwindowsandsiding.com/uploads/1/3/0/9/130969315/6808a1727.pdf
    • http://files.criticalstudies.org.uk/uploads/1/3/0/7/130739814/2085906.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8154/7424/files/itunes_show_duplicates.pdf
    • https://cdn.shopify.com/s/files/1/0436/2017/1936/files/16156041932.pdf
    • https://cdn.shopify.com/s/files/1/0433/2303/1720/files/gudumowagepupepefatefuzal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/nrsv_bible_catholic_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/cervicogenic_headache_physiotherapy.pdf
    • https://cdn.shopify.com/s/files/1/0434/1442/1653/files/reliability_in_qualitative_research.pdf
    • https://cdn.shopify.com/s/files/1/0433/4092/3048/files/newowodurabojasulubajufo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3214/9148/files/nulogapinidefudagi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/23220645451.pdf
    • https://cdn.shopify.com/s/files/1/0437/8735/4270/files/tabibodu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6331/9445/files/gixiwaduna.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/depanufopaxidimelogojojo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7174/files/55361823734.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_off00006a6f.bin
3c8ec94aace1afbfd2457d5dcc04dada872e0a3839127c1735dd02794176b4ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6F 5148 bytes
font_01_sfnt_off00007bee.bin
48d0e0afa2ab5e48d30e6bf69c2fd4d60d86f3fe2171f25b911e03d55808240d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEE 11492 bytes

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