Malicious PDF — malware analysis report

Static analysis result for SHA-256 27698718a6c8f9a8…

MALICIOUS

PDF

56.0 KB Created: 2020-08-20 12:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68b177fc5a18a5ab2d4058df0579e626 SHA-1: 76aae0f758641a7855006b4c1dfd8719cefe0c28 SHA-256: 27698718a6c8f9a89b6aa0f741f831d484dc9182aef4ee5a0ca0a47991dc1044
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or redirector strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=algebra+1+math+answers', suggesting a lure related to educational content. The presence of numerous Shopify-hosted PDF links further supports the link farm tactic.

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=algebra+1+math+answers
    • http://gujanaked.islgrads2020.com/uploads/1/3/1/3/131384424/tonaro-ropuwab.pdf
    • http://files.pazangallery.com/uploads/1/3/1/3/131379037/dibefomovapatosom.pdf
    • http://sutegu.rowdygainesmastersclassic.com/uploads/1/3/1/3/131384260/8167732.pdf
    • http://mavuram.citizenscholarsinstitute.com/uploads/1/3/1/6/131606505/vikelo_vogonotowe_xuwexobevuvew.pdf
    • https://cdn.shopify.com/s/files/1/0433/3384/5150/files/7325203032.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/nuwupidofawisorimemiwab.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/comment_joindre_un_sur_facebook.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/judavefu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4693/files/avner_friedman_advanced_calculus.pdf
    • https://cdn.shopify.com/s/files/1/0433/9964/3286/files/95654975704.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.pdf
    • https://cdn.shopify.com/s/files/1/0449/2269/9943/files/anemia_who.pdf
    • https://cdn.shopify.com/s/files/1/0429/2437/6227/files/glandulas_suprarrenales_funcion_y_hormonas.pdf
    • https://cdn.shopify.com/s/files/1/0436/0824/4381/files/strategic_management_book_mcgraw_hill.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_off000093e2.bin
f23a0819af3619415f7aa0ed7250c91fd4bf282cfca82b5a5c21a758a51d6165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93E2 5372 bytes
font_01_sfnt_off0000a613.bin
a7c3d95246d8ed19c287afb555ad95c440562ca39a010e44ecf10e580895c121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA613 14268 bytes

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