Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bd71e242d34c1f…

MALICIOUS

PDF

37.8 KB Created: 2020-08-23 00:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 424ba111add7e0755d8c24b79f40b2a6 SHA-1: f0fa1d0d2846837ee8e92b727049983ce0f2d292 SHA-256: 50bd71e242d34c1fbf3d040714defa64096813b75b00ac0993674246d1bb74a7
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of the primary links directs to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains the URL for the malicious redirector, suggesting an attempt to lure users to malicious infrastructure under the guise of educational 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/pify?keyword=combining+sentences+worksheets+middle+school
    • http://files.tasmantranscription.com/uploads/1/3/1/8/131856330/nebojokan-nexolirobotob-texabudekupuxu-xedizezilili.pdf
    • http://duzafi.backpackexpedition.com/uploads/1/3/2/3/132303382/remenajem.pdf
    • http://files.festivalofwordsde.com/uploads/1/3/2/8/132814589/ketow-zizeremovebika.pdf
    • https://cdn.shopify.com/s/files/1/0432/4635/4592/files/subowa.pdf
    • https://cdn.shopify.com/s/files/1/0449/8125/6360/files/consider_the_lobster_and_other_essays.pdf
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/dapebiwaler.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38970143778.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54903558396.pdf
    • https://cdn.shopify.com/s/files/1/0440/3062/3894/files/vupazutinaxowawa.pdf
    • https://cdn.shopify.com/s/files/1/0438/9981/4056/files/46320974995.pdf
    • https://cdn.shopify.com/s/files/1/0429/2942/2499/files/62307277831.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8515/files/cheat_sheet_python_numpy.pdf
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/36261993258.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/corrugated_box_design.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_off000055ad.bin
fa153e0ecf1439ed6aa4324234c293b21bfe1dca921cde8736b0d50970d4f8b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55AD 5344 bytes
font_01_sfnt_off000067c2.bin
96c1667946eefb530dca635a20fb5cc4fb746409aaa18b51e8c3b38f9a97bcf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C2 10088 bytes

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