Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc351cc68f05196…

MALICIOUS

PDF

38.8 KB Created: 2020-08-15 03:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 783f31c33f7c12bc3f6e7c0f83ec2a73 SHA-1: 3fc3fb5a6c69b12f146387bd112a66579cafd189 SHA-256: ccc351cc68f05196e81a67a729319d46ac27d3efca255a15646d619555a484d9
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector. The document body, though partially corrupted, includes text related to 'esl grammar worksheets' and the malicious URL, suggesting a lure to disguise the malicious intent. The primary malicious IOC is the redirector URL, which likely leads to further 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.cc/pify?keyword=esl+grammar+worksheets+intermediate+pdf
    • http://files.afiniadentalportal.com/uploads/1/3/1/3/131384070/rigofelive-xejapim-dikepawesodozir-mebex.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/pezuwagabawasiwokituxi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4785/2959/files/15740074073.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6777/files/card_maker_for_mac_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9986/5756/files/antimicrobial_activities_of_garlic_and_ginger_extract.pdf
    • https://cdn.shopify.com/s/files/1/0433/4547/7800/files/7526750974.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/fox_halftime_report_cast.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6995/files/android_x86_emulator_not_starting.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4412/files/rafovilolifidosifi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1290/5370/files/11434643260.pdf
    • https://cdn.shopify.com/s/files/1/0429/4246/4166/files/99923599908.pdf
    • https://cdn.shopify.com/s/files/1/0427/7813/2636/files/numimalarogopivilufaseli.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/lefesuzufone.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_off000059a9.bin
37eb5b7f6b039395cc81020eb89ddcbb278c175b77a513bf7ccb6361390113d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59A9 5568 bytes
font_01_sfnt_off00006c88.bin
e5a03de2167aa02eca877b3a59fc2499593a3d3b3f63f745df8099b3b6a8c718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C88 9956 bytes

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