Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fed4537897c426…

MALICIOUS

PDF

34.2 KB Created: 2020-08-27 22:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 859c3372bf6719167c15f47d59c2c458 SHA-1: f74ddff100672ba11547475bdc6786901deb8389 SHA-256: 25fed4537897c4263b42903946db62a669cb0b8609db5ee416f1e6a6f085a495
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'past tense verbs ks1 worksheet' and the malicious URL, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm used to obscure the malicious redirector. No scripts were extracted from this sample.

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=past+tense+verbs+ks1+worksheet
    • http://baminap.nentraining.com/uploads/1/3/0/8/130873947/fujiropexebumivamif.pdf
    • http://files.beachesinsrilanka.com/uploads/1/3/0/8/130814534/be23603e268f.pdf
    • http://botoxazer.claymark.net/uploads/1/3/1/3/131383483/6815472.pdf
    • http://files.inspiredmusic.us/uploads/1/3/0/9/130969454/da2e4f.pdf
    • https://cdn.shopify.com/s/files/1/0429/3191/2857/files/85353932154.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/avengers_movies_in_tamil_hd.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13336488851.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/globescan_sustainability_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/rojopitavomaxi.pdf
    • https://cdn.shopify.com/s/files/1/0452/5362/3970/files/84014655448.pdf
    • https://cdn.shopify.com/s/files/1/0435/9480/9512/files/waforebejalof.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/puxatazageb.pdf
    • https://cdn.shopify.com/s/files/1/0430/0092/2261/files/wuvazebe.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/fuquay_varina_nc_police_department_accident_reports.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/curso_de_violo_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0457/7578/2054/files/staying_safe_at_home_worksheets.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_off0000488a.bin
162c54980f51085be278f021989cd6bb0843235cdc9780554809cab359aa7770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x488A 5148 bytes
font_01_sfnt_off00005a1d.bin
2d08cddea5330d03e0f60f07c833849fb4ba1cd8e2d21b73e40d4a689b8bae83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A1D 9816 bytes

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