Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e2ede0cab6d2bf0…

MALICIOUS

PDF

49.8 KB Created: 2020-08-06 21:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8631efc8395edfa211aa7931b1581e6 SHA-1: acbaade87107f060b5cc542c9cc332456b6dc9a9 SHA-256: 9e2ede0cab6d2bf021cf6a481502739254d245886e2f552b9cc41d1b17457fd7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, which are likely part of an SEO link farm designed to improve search engine rankings for malicious content. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is used to obscure the ultimate destination. The document body, though heavily obfuscated, contains references to "circle theorems cheat sheet pdf" and the malicious URL, indicating a lure to trick users into visiting potentially harmful sites.

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=circle+theorems+cheat+sheet+pdf
    • http://files.wusdtechfaq.com/uploads/1/3/1/1/131164063/kudupixuvutagog-wegelojaxo-lizelajij-jujevurudazode.pdf
    • http://files.kerri2uganda.com/uploads/1/3/0/8/130813586/mafajuseburofon.pdf
    • http://files.lajollafamilymedical.com/uploads/1/3/0/8/130813975/tawatigukupo.pdf
    • http://files.admiredbuilders.com/uploads/1/3/1/3/131398279/wakoxenufuvufijusud.pdf
    • http://files.fnaq.org/uploads/1/3/0/9/130969944/nivubuluro.pdf
    • https://cdn.shopify.com/s/files/1/0433/2106/5640/files/nofosorusojosut.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/16002967292.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/50940838656.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/89166024632.pdf
    • https://cdn.shopify.com/s/files/1/0436/7984/2457/files/6266971751.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/59574855062.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/rawovasadejuwameb.pdf
    • https://cdn.shopify.com/s/files/1/0434/8733/0464/files/66935774461.pdf
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/pixodowejovokapolu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/rajubojesutakiko.pdf
    • https://cdn.shopify.com/s/files/1/0428/2236/9446/files/c_async_await.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_off00007ca4.bin
cedb24f7b8504fad669b4165ac785b32ad9b3b71f5f4570db43b65c7bba75af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA4 5300 bytes
font_01_sfnt_off00008e78.bin
e1abc589803b476edf85acbc2822b6b85b465dffb03dd7abefc5e89e2bb27a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E78 14300 bytes

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