Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ced841768e4d60c…

MALICIOUS

PDF

42.0 KB Created: 2020-08-29 22:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12121ee4d8f9272a1f3810b4e9ff6bfc SHA-1: a41b774e7630ab0fb2ad652651f0e457214fbe97 SHA-256: 0ced841768e4d60c27d4b321cc8a413bc0441d8a13730d79edca4408cc991887
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a link to a known malicious redirector, indicating an attempt to lure users to a harmful site. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings suggest a phishing or redirection attack, likely delivered as an attachment.

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.ru/wix?keyword=clauses+phrases+and+sentences+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0464/6328/7448/files/high_sea_saga_pet_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/6912/6309/files/31816577606.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/maths_ncert_question_answer_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0434/2739/7797/files/69721697997.pdf
    • https://cdn.shopify.com/s/files/1/0434/6953/7432/files/20977969471.pdf
    • https://cdn.shopify.com/s/files/1/0440/1315/8565/files/xasejosotez.pdf
    • https://cdn.shopify.com/s/files/1/0437/7798/2626/files/47802599578.pdf
    • https://cdn.shopify.com/s/files/1/0435/7757/3539/files/powemitimajuden.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/minna_no_nihongo_lesson_13_mondai_answers.pdf
    • https://cdn.shopify.com/s/files/1/0465/5048/3094/files/prey_it_department_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/20088265837.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/41825305341.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/44435490955.pdf
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/48024725866.pdf
    • https://static.usrfiles.com/ugd/b8c837_84e7eea281714fa3a1c0a06a05a3401c.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d014fd798c8423b829ce8d80b9d38f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d5665c94c84289bad72b7396d0bf35.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ab9fea6b2844dde98454f9542b0f382.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060b0.bin
1270e24478d0780742e95f728bb699adb0a1ab8d31fa016e41dcfe9e803afe5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B0 5220 bytes
font_01_sfnt_off00007278.bin
5948091a04d1770c83b80d1a1869e1efea7589a2bffce30ad525eeef0162bf65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7278 12736 bytes

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