Malicious PDF — malware analysis report

Static analysis result for SHA-256 388e2ce985174d0c…

MALICIOUS

PDF

47.0 KB Created: 2020-07-28 22:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1c0decca39a500f14d42eb1081c05d4 SHA-1: 4388a6d3bccd7df2cc5bfa905c681ffe4d8144d2 SHA-256: 388e2ce985174d0c03e776f91630ace28d4640d25809e41cc88527de469a98ff
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=android+studio+modal+bottom+sheet', which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated by a tool. The presence of a link farm indicates an attempt to manipulate search engine results or distribute malicious content through numerous external links.

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=android+studio+modal+bottom+sheet
    • http://files.paintedponytattoo.com/uploads/1/3/1/3/131379054/3754084.pdf
    • http://files.framptonparkestate.myhackney.org/uploads/1/3/1/4/131414561/bufamakakatu.pdf
    • http://files.cheshireneuroactive.org/uploads/1/3/2/8/132815045/5706238.pdf
    • http://files.educationfoundationoflm.org/uploads/1/3/1/8/131857419/kamolikex_fereniwalom.pdf
    • http://files.atlantadentalanesthesia.com/uploads/1/3/1/4/131455883/najikenusapijevofifu.pdf
    • http://files.educationfoundationoflm.org/uploads/1/
    • https://cdn.shopify.com/s/files/1/0434/8179/2664/files/56487690592.pdf
    • https://cdn.shopify.com/s/files/1/0435/1878/7743/files/29001231991.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/23506051216.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/kepegolusavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/xawakuxavuravaridazowu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/jolenazudavekalofusuzuk.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3416/files/73194910326.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kenawuvotijogajutimev.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/74242001132.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_off00006c7b.bin
7ce987a9fc99a53308fa9258a1b3e7b5b29c97b667ed34e681d47b17675f5bf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7B 5076 bytes
font_01_sfnt_off00007d7c.bin
e9763db3b8c83e2999b371e80da2d4ea9d5664f6b64dfdf20738c856e5566ddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7C 15220 bytes

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