Malicious PDF — malware analysis report

Static analysis result for SHA-256 585554a403c33317…

MALICIOUS

PDF

45.7 KB Created: 2020-08-05 10:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67deef29af2f9b41935f765fdb0c8f57 SHA-1: d73cfac7a182a5952fe54c8936502b0adbd87033 SHA-256: 585554a403c33317115db46f6db71eb901cf91ab4e0e61a0aa0e2fbc4d297026
120 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and references 'summarizing and paraphrasing exercises', suggesting a lure to disguise the malicious intent. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine visibility for the malicious content.

Heuristics 3

  • 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.
  • 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=summarizing+and+paraphrasing+exercises+with+answers+pdf
    • http://files.kaindl-us.com/uploads/1/3/1/4/131438245/df4dd33ce5f22c.pdf
    • http://files.tamueventing.com/uploads/1/3/1/3/131380005/tijukinupudag.pdf
    • http://files.jeskare.com/uploads/1/3/2/7/132710715/7572291.pdf
    • http://files.enderbypreschool.org/uploads/1/3/1/4/131454065/pagaxom_fukunej_kerebevol.pdf
    • http://files.sarahhauser.com/uploads/1/3/1/3/131383743/a12f3ef965d10a4.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/15059993755.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6843/files/95012947821.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/botapiwuretugasurelur.pdf
    • https://cdn.shopify.com/s/files/1/0431/5165/5076/files/85715526954.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/56561228858.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/lotatunepapewesikok.pdf
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/nawivasitozajabomotelo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5403/1270/files/54908682041.pdf
    • https://cdn.shopify.com/s/files/1/0431/1610/1793/files/20166656351.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1333/files/31287649790.pdf
    • https://cdn.shopify.com/s/files/1/0432/5507/0880/files/rebivi.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_off000072d4.bin
1bf41ec4d24843c1d70caca5220c5c8af0aa0c43d66dbd280b21a0f973c4114f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D4 5848 bytes
font_01_sfnt_off000086b5.bin
b8c0d0f012f15e59368260aeae04bc38a0b730330e6af303ab71bc5b93eeac44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86B5 10120 bytes

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