Malicious PDF — malware analysis report

Static analysis result for SHA-256 50965707ae171c4c…

MALICIOUS

PDF

45.6 KB Created: 2020-09-17 12:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e96ef65b14f2912ac526bb0ed1dd73f9 SHA-1: f91568b939cde62c125f67a7380b45a5eb757c45 SHA-256: 50965707ae171c4c2d11475528d5f26b1fd1fce2eb52b2bf89307e99d36bccb9
154 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and a title related to 'Laura Charles death', likely a lure. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious URL. The primary attack pattern involves social engineering through a link farm to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.club/wix?keyword=laura+charles+death
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mukevomisuso.pdf
    • https://cdn.shopify.com/s/files/1/0432/8253/0472/files/26766965862.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/philadelphia_eagles_schedule_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5591/files/android_reader_with_bookmarks.pdf
    • https://cdn.shopify.com/s/files/1/0429/9381/1619/files/pajek.pdf
    • https://cdn.shopify.com/s/files/1/0437/8758/3650/files/92851208790.pdf
    • https://cdn.shopify.com/s/files/1/0440/1466/5878/files/california_earth_science_6th_grade_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/9160/8227/files/lerogazibigukonebewazo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5845/2897/files/ps4_emulator_for_android.pdf
    • https://44cbcc96-4877-4fab-abd1-00a8c28b91cb.filesusr.com/ugd/96564c_9b3b9f618d5d44969f3d95d7b529f45b.pdf?index=true
    • https://428d03de-2769-41a0-9f8e-3db3c6c757ae.filesusr.com/ugd/8c0e65_b57243a5028b42af844542727bb0e682.pdf?index=true
    • https://8cd25749-cf7e-4bc7-adcf-4a0bec225588.filesusr.com/ugd/65d6f7_52630a08ce4c43ba83d42ef65f22f655.pdf?index=true
    • https://620af525-c5f0-46b1-9f83-20b8a57a6b0d.filesusr.com/ugd/43d598_59a42dd85005423d9bfa30568ca80efe.pdf?index=true
    • 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_off0000764e.bin
b194e2ae29f977d0634e8f18936969a1d3f5d1827e055d8ea15d69ecdff9f01d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764E 4968 bytes
font_01_sfnt_off0000872a.bin
0d379b9fcfcb7952b35eb09f75255ab01c252c547782b66552504938779d1ace		 pdf-font-stream PDF embedded font (sfnt) at offset 0x872A 10152 bytes

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