Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04f09ac095895de…

MALICIOUS

PDF

40.4 KB Created: 2020-10-16 21:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f4801fb0183bd5e9038dc63e014cee5a SHA-1: 532571f5a37e98faf5f3fbd942be6a751da5db20 SHA-256: e04f09ac095895de13092f2b4d047d2b10f849d4de75cd838c1586fc37168792
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a high number of embedded links, many of which point to external PDF files. One of these links, 'https://ttraff.me/123?keyword=adverbs+and+adverbial+phrases+pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure 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.me/123?keyword=adverbs+and+adverbial+phrases+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_5f88a35b0a535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f89881b73696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f874c9512b0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f89c13f20e2f.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/1/0433/4524/8421/files/steel_boned_corset_before_and_after.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/0396/7150/files/gtbank_mobile_banking_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8490/1277/files/how_great_is_our_god_chords_ukulele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1246/7106/files/37485947204.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2754/1409/files/jurizidemuxenekunux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57fe952c-51a7-4bda-820a-6159064f959f/30829371515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6240064b-ca3b-47b9-874a-cf87dc69a478/35024142677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063181c4-79a3-429c-8a8f-278311512b35/xamimik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0101/9548/files/passive_voice_worksheets_grade_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/9.5_practice_a_geometry_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9957/4438/files/20068478049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04635149-56ac-4160-94cd-4fb02ebfe081/11767088827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2dcdf24-180c-48a2-a20c-e0505b877e80/sisonewagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d51a7b7-6027-44c1-a687-efb3652b8141/78858726948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93aa4bb2-7e7b-4bbf-b4fc-5a1faf292829/batorawuromezizixab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375fb289-f181-406b-b420-2eb4e96e4b13/poduzutetegowigudapipom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d2c895-eaee-4997-90b7-09f2991ab6ab/jetegitonabinon.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_off00006167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6167 5320 bytes
SHA-256: 56d46a53c3863b34f9e72ff719bd33daed32f04fe9351dd0d7c259d5a9f95f98
font_01_sfnt_off00007371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7371 9664 bytes
SHA-256: d1eeb3972f245e7d9b43d5e5f7fea4c5d4e22b57198a5ac1ccf4b9e19e8ef6c0

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