Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5dd5cbbb336b9f…

MALICIOUS

PDF

44.7 KB Created: 2020-09-17 10:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ccb03372ff985ef7e31cc087a22b553 SHA-1: 786637f8f3f22452a6499640d974335f0587d8ab SHA-256: 9c5dd5cbbb336b9f01bd393dba93caff414728dfadb6bbcb8f44fb809cdd38f8
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to domains associated with link farms and redirectors. The primary malicious link, https://ttraff.club/wix?keyword=halves+worksheet+year+2, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and others, suggesting a social engineering attempt to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.club/wix?keyword=halves+worksheet+year+2
    • http://vixowif.acupunctureonsaltspring.ca/uploads/1/3/1/0/131070197/gekenupunofu.pdf
    • http://muwufav.awwe.org/uploads/1/3/1/0/131071157/zilarije.pdf
    • http://jomug.therealneverdie.net/uploads/1/3/0/8/130874521/lewoz.pdf
    • https://cdn.shopify.com/s/files/1/0447/3477/5445/files/ldc_answer_key_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/rinatunokevajulexalowit.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3763/files/original_cinderella_story.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1320/files/jafozakanolus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/sheet_metal_worker_job_description_australia.pdf
    • https://cdn.shopify.com/s/files/1/0449/3810/0891/files/56552148552.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3630/files/android_qr_scanner_front_camera.pdf
    • https://cdn.shopify.com/s/files/1/0437/8673/1681/files/thin_bendable_plastic_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66456909559.pdf
    • https://d927d002-92a4-4726-9145-2acfa094f702.filesusr.com/ugd/5aec95_ec086f0d37514ef5908a73fc068050e2.pdf?index=true
    • https://fa336faa-566f-48db-bbaa-738a8c9f5c61.filesusr.com/ugd/99b222_290e7d39aa2642a69c1fb36c29235447.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_off0000709f.bin
755c07695ff106d547441bde284456f80f574e5f78896b398e1a7847f650b8a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709F 5184 bytes
font_01_sfnt_off0000824e.bin
5658fa866513b8c8ab3dc979c6f1624868794fa84d7c958c374283c5dd899109		 pdf-font-stream PDF embedded font (sfnt) at offset 0x824E 10412 bytes

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