Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6c9b01d79452de…

MALICIOUS

PDF

54.8 KB Created: 2020-08-12 09:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ff5bf6d1de72556c0dbe006a03e3f0f SHA-1: 83bce7c4528f46fb20e58442d4ebec8d606c1264 SHA-256: 6a6c9b01d79452ded8aea31eee345ac0479eb3e9c06f15bb5740afd77dd1a11c
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 hosted on various domains, indicating a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wb?keyword=kamus%20terminologi%20medis%20pdf', suggesting a malicious intent to direct users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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/wb?keyword=kamus%20terminologi%20medis%20pdf
    • http://vuwida.hartfordcathedral.org/uploads/1/3/0/8/130874359/jatekimefevixofe.pdf
    • http://files.therosievida.com/uploads/1/3/0/8/130815213/dopumonabag.pdf
    • http://files.ringmakers.com/uploads/1/3/1/4/131483138/topavasusujolifi.pdf
    • http://files.1small-step.com/uploads/1/3/0/7/130740262/govur-velolifiki-tofujimumopej.pdf
    • http://files.brandysmassagevictoria.com/uploads/1/3/0/8/130874614/4646976.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3658/0757/files/2043550639.pdf
    • https://cdn.shopify.com/s/files/1/0433/4406/8773/files/vodibasorugapuwe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nimapudusakodinufuzexive.pdf
    • https://cdn.shopify.com/s/files/1/0430/4653/5322/files/the_ultimate_guide_to_business_process_management.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fapodepemiretewuroraga.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/38327443370.pdf
    • https://cdn.shopify.com/s/files/1/0428/9927/5935/files/67027872108.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3967/files/86416949799.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/calendario_spal_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/zavot.pdf
    • https://cdn.shopify.com/s/files/1/0431/4755/9067/files/vertex_form_definition.pdf
    • https://cdn.shopify.com/s/files/1/0433/2768/4760/files/sojasugipalapatubepevem.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/91077891601.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007844.bin
8c3af7316daad8c78d23123a10f5e3ef96315a55429b816b83e352115b4940fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7844 5328 bytes
font_01_sfnt_off00008a51.bin
0f66757a2c8df78f8e17666aee63ada722d7ff486680948ac10550966204ff0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A51 14968 bytes
font_02_sfnt_off0000b8d8.bin
ff1ea3a1df6387b973574bca2b18086736f4800eb06b6bc6003891141b8a4e57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D8 16164 bytes

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