Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c28a828c79db15…

MALICIOUS

PDF

93.4 KB Created: 2020-10-27 15:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 01c634dfc71e048fda71f0d65543e023 SHA-1: 5cb4cb65bf2d5fbf70e2f515a9d866bbc72b7b5d SHA-256: 87c28a828c79db1504e134d1b721fc14bf01ae7403cff1714356cca1e27f252e
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with keywords likely intended to attract user clicks. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm or SEO poisoning attempt. The document body, though heavily obfuscated, contains the malicious URL and keywords that align with the heuristic findings.

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.cc/123?keyword=bigg+boss+11+3rd+december+2017+calendar In PDF document text
    • https://pinonomobeberex.weebly.com/uploads/1/3/4/3/134318871/1268437.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/1867598.pdfIn PDF document text
    • https://demifoji.weebly.com/uploads/1/3/4/3/134317184/xudusa.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/bukabitufi-rinirujusubuwat-jajosoviwuwewol.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/mexifogizalog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8e1e5bbed27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f87053317d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_5f97709ca669e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f8e36d55b84e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5f93075783eea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/rixugadinemozurezemaf.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/verb_to_be_affirmative_negative_interrogative.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/definicion_de_oliguria.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/mathematics_investigatory_project.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76202ac7-7e33-41ec-bc41-e51219ac23d2/personal_finance_final_exam_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8ab774-5b75-47b4-9124-fad45368f397/dupiketalevevosaligej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adb7f944-ce0a-4803-94f3-70c433aefe36/tiny_turtle_dragon_mod_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e44ecdb6-43f1-4536-8e31-a90888477f07/virtual_villagers_5_walkthrough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816a6a8b-4e5d-4a05-978a-d967f3370b12/30313439484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d30ec48-93a2-44a2-a9b5-2c7c48161177/lilido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1efbeb42-8c14-41d1-97e8-ac9378e940c3/persian_boy_names.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1F 6020 bytes
SHA-256: 0cecbc6cbfc78871d939cf3406a8bae3c2917ef4115b4b7553fc11655ad08cbe
font_01_sfnt_off0001417c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417C 11360 bytes
SHA-256: a3c52b0e5d9adad84523e8f7f3eb44e4c3e9e49e5216833db934abfd4046545a

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