Malicious PDF — malware analysis report

Static analysis result for SHA-256 e344137976f890fa…

MALICIOUS

PDF

35.5 KB Created: 2020-08-15 09:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8737cee59389a55074b3e1a93ed1d719 SHA-1: 12a89d82691f136982374f3db9e9ecfbcc751424 SHA-256: e344137976f890fa04c2114e2d6eb4f93e3504b1d8f06cdc2455425c0e016d75
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary heuristic identifying a link to a known malicious redirector. The document body, though partially corrupted, contains text related to 'sentence construction worksheets ks1' and the malicious URL, suggesting a lure to disguise malicious activity. The presence of multiple external PDF links further supports the SEO link farm heuristic, indicating an attempt to distribute malicious content.

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.com/wb?keyword=sentence%20construction%20worksheets%20ks1
    • http://files.clickitandcartit.com/uploads/1/3/1/8/131856770/0f6814b4.pdf
    • http://files.stickwithitpalette.com/uploads/1/3/0/7/130776500/28b6664b447bf13.pdf
    • http://files.brandonrdavis.com/uploads/1/3/2/6/132682471/dibasefawalabuneviz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/mario_vazques_gallery.pdf
    • https://cdn.shopify.com/s/files/1/0435/0997/3147/files/apprentice_attendance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2402/3715/files/laruwiwudozukikolefekuka.pdf
    • https://cdn.shopify.com/s/files/1/0437/7070/8129/files/gatutilunugovuziwokefa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6554/8705/files/10103437618.pdf
    • https://cdn.shopify.com/s/files/1/0443/0499/0364/files/bitwise_operators_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0428/6971/9196/files/puwafimun.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/gotovojabekoje.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/number_properties_gmat_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/sawizazebanavebikabidifox.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_off00004f5e.bin
29d2052809b0989a23844f89c10fcad49f286afc86cdbc39af932372d7b50862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F5E 4956 bytes
font_01_sfnt_off0000604f.bin
e60548d0625b7fa2f2ce737964b1c060f938bbdb4726e7be13dd886307748b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604F 9712 bytes

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