Malicious PDF — malware analysis report

Static analysis result for SHA-256 76faca9220a6925d…

MALICIOUS

PDF

43.7 KB Created: 2020-10-01 10:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c5d470d262102da7c16e0061cb895568 SHA-1: 38abfb14ca87f8d0d73c8769938cdd3e2d4e9694 SHA-256: 76faca9220a6925dce338ac492fffced5511a5ab4194d7f7b8f84e6f977abac2
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious due to its function as a link farm, directing users to multiple external websites, including a known malicious redirector. The document body contains obfuscated text and embedded URLs that likely serve to disguise the malicious intent and potentially exploit SEO techniques to distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the heuristic findings.

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://cctraff.ru/strik?keyword=anatomy+of+earthworm+pdf In PDF document text
    • http://furitopu.tiokayoga.com/uploads/1/3/1/1/131164132/lokup_gadovofitufu_lomazoxijakede.pdfIn PDF document text
    • http://fupajevot.secondhandlife.org/uploads/1/3/2/6/132682006/2c2460df6.pdfIn PDF document text
    • http://zajiju.corechiropracticandperformance.com/uploads/1/3/1/4/131453465/dd3a1f04a55c6.pdfIn PDF document text
    • http://zuzegotub.psideltaalumni.org/uploads/1/3/0/7/130775189/bb836c5.pdfIn PDF document text
    • https://site-1036957.mozfiles.com/files/1036957/vipogatigakuresajokafod.pdfIn PDF document text
    • https://site-1036900.mozfiles.com/files/1036900/zisolifoxogoxurewazer.pdfIn PDF document text
    • https://site-1037177.mozfiles.com/files/1037177/9230477048.pdfIn PDF document text
    • https://site-1037911.mozfiles.com/files/1037911/60477870865.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/11baea3d-00ca-46c0-8706-76bba55c237b/96306044121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a4c944-9639-4aff-b6b3-9ffd91c64903/dusilenowil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1819/6891/files/solution_worksheet_grade_7.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7004/3813/files/regidegijefuzasobifo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E6 4996 bytes
SHA-256: ac19cdf276d33268e4142cba16dbbbf7be7b62147da28dc538d9e70cfbfa1400
font_01_sfnt_off000072c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72C2 9772 bytes
SHA-256: f279cca8bfbdffa179c6bffeebca3765980beba447481020fe42288971f42f21
font_02_sfnt_off00009413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9413 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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