Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ca4f63dcb42f6a…

MALICIOUS

PDF

41.6 KB Created: 2020-09-19 09:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0ea5dd8f85292446c2b49d6465aef5f SHA-1: 1769097c2ad2cca09059b4f1596ce9b0f53d790b SHA-256: 71ca4f63dcb42f6a2b2a010e8b54e86bd3a1787f2524eff20ea11d7185583aed
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many pointing to disposable hosting, and one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL for the malicious redirector and several other PDF links, indicating a clear intent to lure users to external, potentially harmful, sites. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.me/wix?keyword=world+cup+penalty+2010+unblocked
    • http://witafi.evaairways.org/uploads/1/3/0/7/130740235/6d2c4ff249.pdf
    • http://kikakos.advancedenergywork.com/uploads/1/3/0/7/130776445/sulanelumebige.pdf
    • http://pivovu.gordonstounartandphotography.com/uploads/1/3/0/7/130738948/mowazeworat.pdf
    • http://files.themountbowman.com/uploads/1/3/0/8/130874474/335548aa8f536f.pdf
    • http://wotivaxip.wildlittlemonkeys.com/uploads/1/3/0/9/130969060/pexugepovaku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0463/2448/2210/files/whatsapp_for_nokia_e71_ovi_store.pdf
    • https://cdn.shopify.com/s/files/1/0428/5625/1555/files/milufifetibil.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/tisepofum.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5067/files/20313277457.pdf
    • https://cdn.shopify.com/s/files/1/0440/6994/5509/files/guia_ceneval_universidad.pdf
    • https://cdn.shopify.com/s/files/1/0429/3502/5831/files/jusonubalidobupo.pdf
    • https://f30605c5-1d8d-460c-b488-b1a8d3902692.filesusr.com/ugd/834936_c4a593e720f54ffd935af74cc1644166.pdf?index=true
    • https://a7faa4b0-a41c-4c77-b4bb-eb2275c46225.filesusr.com/ugd/54e393_3a740b3bb2f84029aed824d21cbc715d.pdf?index=true
    • https://aa30dd75-e386-4447-8e41-2ecb22625144.filesusr.com/ugd/e80f4c_ba248a29e0664ac98770dd0afec7e0ed.pdf?index=true
    • https://6c458e6d-9dd0-4be0-99f3-e3952495f488.filesusr.com/ugd/271e65_e89d649a1b9e4d69ab0886e5d1b2e01a.pdf?index=true
    • 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_off00006112.bin
1266036ef8b0e570e80d2a63dc40e10bf0afee99ba0d9db0d392fbc42f42f7fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6112 5536 bytes
font_01_sfnt_off00007407.bin
9960cc1811e10115ec1f7e4b002c24f8fa5932c4be9473498e91b666a010d3f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7407 10424 bytes

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