Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ea08245eff7682…

MALICIOUS

PDF

46.7 KB Created: 2020-10-18 02:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9cd8c08a0d3512df4e0f58c26edff2fa SHA-1: 9f3472282012a35112a51c141f35950de04a60d5 SHA-256: 12ea08245eff7682289980a1f3d6c06cadc6649c1608db64b2b5d8f44f1dbc57
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF document was identified as malicious by an ML classifier and contains a significant number of embedded links. One of these links, https://gettraff.ru/wb?keyword=dgb%20material%20impreso, points to known malicious redirector infrastructure. The document appears to be a link farm, likely intended to drive traffic to malicious sites or engage in SEO spam, rather than deliver a direct payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/wb?keyword=dgb%20material%20impreso In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5f8b5c135e748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5f8b654d0362e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372985/normal_5f8a00633d3a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_5f8b5e2e4fb33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f880f8939c05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5f8b60861fd55.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/munegazimu_gesozuvedit_tenes.pdfIn PDF document text
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/zedusekigovu_jirul_pozovegow_vipavubosu.pdfIn PDF document text
    • https://netulomite.weebly.com/uploads/1/3/2/8/132814473/21d0974f.pdfIn PDF document text
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/bimatijumonole.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/4fcf7b50e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8149/7766/files/speech_and_language_development_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7922/8837/files/menschen_a1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2210/4754/files/feedback_control_system_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5805/5318/files/robert_morris_chicago_blackboard.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0466/5281/7573/files/ap_ysr_rythu_bharosa_beneficiary_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3025/6536/files/how_to_create_bitmap_drawable_in_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba120d35-ac49-4cc6-be28-54d58eb6b267/zozurulelasokoguroku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb7af87-537e-4f80-ba3a-babd5a463a88/58930026378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb650a4-cc8d-42f1-9d80-149f98d79121/miwopu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6049 5280 bytes
SHA-256: 161711fe1914e8b74fa35175eee8cf22defc230c2877b88f20d984ff0e17cef4
font_01_sfnt_off00007226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7226 10808 bytes
SHA-256: 95c5f748d7df5768dd8bed1b3875136776e54ad1bd8176ee60f339bf987044ac
font_02_sfnt_off000095bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95BD 16416 bytes
SHA-256: e1b2b4688557f53d7bb3b0cae3646c5c298247c7f5722a4b8c84b67043f591e1