Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d17635ef198a49…

MALICIOUS

PDF

41.5 KB Created: 2020-09-16 15:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0055fc05e46b6e3e7ae6b5ac5d35d582 SHA-1: 2cdf8d3ab785b8a94e811d4bc8130d1ca777af1f SHA-256: 37d17635ef198a493145be3c5efa745ab6ac636983e90077405b5eac68959629
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a large number of embedded links, many pointing to external PDFs. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.club/wix?keyword=rhetorical+verbs+list+ap+lang'. The document body contains garbled text but does include the aforementioned malicious URL and several other URLs hosted on Shopify and other domains, some of which are unknown and could be used for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.club/wix?keyword=rhetorical+verbs+list+ap+lang
    • http://wupituz.kellycozzone.com/uploads/1/3/1/3/131379578/bozematofewexibot.pdf
    • http://pivovu.gordonstounartandphotography.com/uploads/1/3/0/7/130738948/mowazeworat.pdf
    • https://cdn.shopify.com/s/files/1/0436/7125/7241/files/abstract_reasoning_practice_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0462/2768/5525/files/new_balance_695.pdf
    • https://cdn.shopify.com/s/files/1/0433/8722/4214/files/pufulogalaxutiji.pdf
    • https://cdn.shopify.com/s/files/1/0464/6171/4584/files/44520567321.pdf
    • https://cdn.shopify.com/s/files/1/0461/9586/7797/files/astringedent_safety_data_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7526/files/33739732300.pdf
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/5976228993.pdf
    • https://cdn.shopify.com/s/files/1/0434/4076/7132/files/alzheimer_s_society_factsheet_power_of_attorney.pdf
    • https://cdn.shopify.com/s/files/1/0438/2490/6397/files/nodusijuzunazewuv.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0617/files/98310829466.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8311/files/42237138126.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_off000063f3.bin
34a8e99f4a9ab24891be8e3b094b372a3598331356fbdc9c54b9f3fbcc24b1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F3 5404 bytes
font_01_sfnt_off00007653.bin
6d8ba5b7c7cf299c556ca569dd9af4a704ac7faeaab203a9db743d107da63430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7653 10344 bytes

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