Malicious PDF — malware analysis report

Static analysis result for SHA-256 33683a8f6b9b40c2…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 01:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64b02e55bccc41967d2f8b51e2b4c95f SHA-1: 72ae8bca871f8d3156cef2ff6c073194b2bb7790 SHA-256: 33683a8f6b9b40c285af6f4504e4b7125398d777368fbcc664cf563192f05590
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 partially corrupted, includes text related to 'free printable 4th grade multiplication sheets' and the malicious URL, suggesting a lure to disguise the malicious intent. The presence of a link farm heuristic further indicates an attempt to distribute malicious content through seemingly legitimate platforms.

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/wix?keyword=free+printable+4th+grade+multiplication+sheets
    • https://cdn.shopify.com/s/files/1/0436/1617/4243/files/90461006424.pdf
    • https://cdn.shopify.com/s/files/1/0434/4014/4534/files/pevinixe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/2nd_conditional_lesson_plan.pdf
    • https://cdn.shopify.com/s/files/1/0428/3593/5388/files/wildtangent_games_virus.pdf
    • https://static.usrfiles.com/ugd/b8c837_82215c7f92a84d68842c521fdb60dc0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_51daf907da9847f090bb1f03e0535f51.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/how_to_write_book_report_quickly.pdf
    • https://cdn.shopify.com/s/files/1/0431/7832/8224/files/nupegiwatumanige.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/operations_management_heizer.pdf
    • https://cdn.shopify.com/s/files/1/0438/3195/1517/files/lala_ramswaroop_calendar_2020_free.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/16928505969.pdf
    • https://static.usrfiles.com/ugd/e745be_00078b9018954d27816393991de8d50f.pdf
    • https://static.usrfiles.com/ugd/b8c837_2feb3207110045b49669b7db72003470.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_off0000621a.bin
1c517e38689237392d0c791e1e8b566aed9f6d86de5d947269f16ac4129bbab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x621A 5672 bytes
font_01_sfnt_off00007528.bin
3c4c030b7f9e257aaf20da5870c776758d0bc29b0cc3b09b171cadd047367d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7528 10564 bytes

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