Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bdfdcf8bd7af66…

MALICIOUS

PDF

33.0 KB Created: 2020-08-10 15:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 409a502fd6b98924cb33f9e184627409 SHA-1: 2d41689931b04b3c637fb623826532eed08ab15b SHA-256: 73bdfdcf8bd7af66037d0d87d3143bdf8108de71dd24c39bf67a079cb67f1c57
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDFs hosted on Shopify. One prominent link, 'https://ttraff.ru/pify?keyword=ielts+writing+task+1+general+answer+sheet+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Ielts writing task 1 general answer sheet pdf', suggesting a lure to trick users into clicking the malicious link. 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=ielts+writing+task+1+general+answer+sheet+pdf
    • http://files.sopwhsv.org/uploads/1/3/1/3/131383826/685f3bd.pdf
    • http://files.seiburyusanjose.com/uploads/1/3/0/7/130775180/1353430.pdf
    • http://files.tri-waymold.com/uploads/1/3/0/8/130813108/nomefovilirutijegot.pdf
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/zosiwekebulexixu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5242/files/pofavutotoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/3874/4469/files/benim_hocam_kpss_tarih_ders_notlar.pdf
    • https://cdn.shopify.com/s/files/1/0443/6351/4012/files/brokeback_mountain_text.pdf
    • https://cdn.shopify.com/s/files/1/0432/3275/5875/files/70278973877.pdf
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/3_day_workout_routine_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/92823847656.pdf
    • https://cdn.shopify.com/s/files/1/0435/9212/2536/files/54724353643.pdf
    • https://cdn.shopify.com/s/files/1/0428/6342/7751/files/noes_bsicas_de_administrao_pblica_para_concurso.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/77942107652.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/nunokip.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_off00004526.bin
e7cf85d1a8d907f1acc15fd68c2a8d892e78f34bb7adfc560065fc1effb08e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4526 5448 bytes
font_01_sfnt_off000057bb.bin
2909deded13a8b6d7967f96f46b0e79acf80f36e5e759d92a6727522a15000bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57BB 9148 bytes

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