Malicious PDF — malware analysis report

Static analysis result for SHA-256 94618d691ebbf2b9…

MALICIOUS

PDF

40.6 KB Created: 2020-08-23 04:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0611648580038213049b29ec2d721188 SHA-1: 75ea415d308339d0e06de01ffd7672b8b16a40b1 SHA-256: 94618d691ebbf2b9e558b9255cd9bfa1a7ac5dd824dae806541ff14fd9165b75
128 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised as a download for 'free printable biology worksheets'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, likely for SEO manipulation or to host further malicious content. The presence of a visual download button further supports the lure.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.cc/pify?keyword=free+printable+biology+worksheets+for+middle+school
    • http://files.shelleypearsonwrites.com/uploads/1/3/0/7/130775786/kokizererurerom-wanemakedilex-nozorenon.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/27782694080.pdf
    • https://cdn.shopify.com/s/files/1/0429/1300/5724/files/cambridge_primary_science_stage_4_activity_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/7610/5893/files/rojuzilitumabibudotediv.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2983/files/95297980541.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lokilus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/91404601427.pdf
    • https://cdn.shopify.com/s/files/1/0437/1179/1257/files/65529899860.pdf
    • https://cdn.shopify.com/s/files/1/0429/0491/2031/files/rosub.pdf
    • https://cdn.shopify.com/s/files/1/0432/3495/1331/files/composite_materials_by_kk_chawla_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/19366622886.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_off000059ff.bin
c4d974a6c9ab2cb1787570ec755812df05533795e2acb13810992da93ff5e844		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59FF 5920 bytes
font_01_sfnt_off00006e08.bin
4e204a6d34bb79812b3079f3d981febd761014d52ed678c6827ed375e17cf168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E08 11604 bytes

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