Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eff1ca5e8c2289f…

MALICIOUS

PDF

74.4 KB Created: 2020-08-01 23:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e015252d6658a774f31ae21970cea3e2 SHA-1: 3a04f2987345f02fd4da90c8690598a2a5064185 SHA-256: 8eff1ca5e8c2289f77253217ce480ddd39bf6637239783e2488e4f3328fdb60e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=99+mining+guide, which is presented as a "99 mining guide" in the document body. The file also exhibits characteristics of a PDF link farm, with many links pointing to Shopify domains, likely for obfuscation or to appear more legitimate. The ML classifier 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/pify?keyword=99+mining+guide
    • http://files.carlyberg.com/uploads/1/3/1/4/131407459/giwob.pdf
    • http://files.choosinghealth.org.uk/uploads/1/3/2/6/132681699/xunuwixa_fonejoba_linufagip_worab.pdf
    • http://files.idshsaus.com/uploads/1/3/0/8/130874240/xikuva-bovuzujajifoz.pdf
    • http://files.mackjennifer.com/uploads/1/3/0/7/130776661/zajepibugumesozibato.pdf
    • http://files.mylavishlylathered.com/uploads/1/3/0/7/130738871/nineva.pdf
    • https://cdn.shopify.com/s/files/1/0432/5533/3027/files/99039913135.pdf
    • https://cdn.shopify.com/s/files/1/0436/9953/6040/files/xulapukiwod.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2354/files/pikezuvo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/77651994261.pdf
    • https://cdn.shopify.com/s/files/1/0428/6650/7942/files/30767100175.pdf
    • https://cdn.shopify.com/s/files/1/0437/0962/8570/files/49186017063.pdf
    • https://cdn.shopify.com/s/files/1/0438/4981/0080/files/tawovatabujobezuw.pdf
    • https://cdn.shopify.com/s/files/1/0439/4903/1592/files/widowesibikibofunugexevim.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9475/files/21288083732.pdf
    • https://cdn.shopify.com/s/files/1/0437/0546/7035/files/juvoworatagejuwoper.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/fixajivenaf.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e269.bin
34ac0d18a0997c26a4cb3e0db94aed9dca29e70e2fa9a2a48fa0a8ea8b125780		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 4688 bytes
font_01_sfnt_off0000f24d.bin
127436ee6847633da29a47348db5419b38b539d447ece59e8e967ca30cf0cd79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 13336 bytes

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